/*!
 * Less - Leaner CSS v3.9.0
 * http://lesscss.org
 *
 * Copyright (c) 2009-2018, Alexis Sellier <self@cloudhead.net>
 * Licensed under the Apache-2.0 License.
 *
 */

 /** * @license Apache-2.0
 */

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.less = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
    var addDataAttr = require('./utils').addDataAttr,
        browser = require('./browser');
    
    module.exports = function(window, options) {
    
        // use options from the current script tag data attribues
        addDataAttr(options, browser.currentScript(window));
    
        if (options.isFileProtocol === undefined) {
            options.isFileProtocol = /^(file|(chrome|safari)(-extension)?|resource|qrc|app):/.test(window.location.protocol);
        }
    
        // Load styles asynchronously (default: false)
        //
        // This is set to `false` by default, so that the body
        // doesn't start loading before the stylesheets are parsed.
        // Setting this to `true` can result in flickering.
        //
        options.async = options.async || false;
        options.fileAsync = options.fileAsync || false;
    
        // Interval between watch polls
        options.poll = options.poll || (options.isFileProtocol ? 1000 : 1500);
    
        options.env = options.env || (window.location.hostname == '127.0.0.1' ||
            window.location.hostname == '0.0.0.0'   ||
            window.location.hostname == 'localhost' ||
            (window.location.port &&
                window.location.port.length > 0)      ||
            options.isFileProtocol                   ? 'development'
            : 'production');
    
        var dumpLineNumbers = /!dumpLineNumbers:(comments|mediaquery|all)/.exec(window.location.hash);
        if (dumpLineNumbers) {
            options.dumpLineNumbers = dumpLineNumbers[1];
        }
    
        if (options.useFileCache === undefined) {
            options.useFileCache = true;
        }
    
        if (options.onReady === undefined) {
            options.onReady = true;
        }
    
        if (options.relativeUrls) {
            options.rewriteUrls = 'all';
        }
    };
    
    },{"./browser":3,"./utils":11}],2:[function(require,module,exports){
    /**
     * Kicks off less and compiles any stylesheets
     * used in the browser distributed version of less
     * to kick-start less using the browser api
     */
    /* global window, document */
    
    // TODO - consider switching this out for a recommendation for this polyfill?
    // <script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>
    // Browsers have good Promise support
    require('promise/polyfill');
    
    var options = require('../less/default-options')();
    
    if (window.less) {
        for (key in window.less) {
            if (window.less.hasOwnProperty(key)) {
                options[key] = window.less[key];
            }
        }
    }
    require('./add-default-options')(window, options);
    
    options.plugins = options.plugins || [];
    
    if (window.LESS_PLUGINS) {
        options.plugins = options.plugins.concat(window.LESS_PLUGINS);
    }
    
    var less = module.exports = require('./index')(window, options);
    
    window.less = less;
    
    var css, head, style;
    
    // Always restore page visibility
    function resolveOrReject(data) {
        if (data.filename) {
            console.warn(data);
        }
        if (!options.async) {
            head.removeChild(style);
        }
    }
    
    if (options.onReady) {
        if (/!watch/.test(window.location.hash)) {
            less.watch();
        }
        // Simulate synchronous stylesheet loading by hiding page rendering
        if (!options.async) {
            css = 'body { display: none !important }';
            head = document.head || document.getElementsByTagName('head')[0];
            style = document.createElement('style');
    
            style.type = 'text/css';
            if (style.styleSheet) {
                style.styleSheet.cssText = css;
            } else {
                style.appendChild(document.createTextNode(css));
            }
    
            head.appendChild(style);
        }
        less.registerStylesheetsImmediately();
        less.pageLoadFinished = less.refresh(less.env === 'development').then(resolveOrReject, resolveOrReject);
    }
    
    },{"../less/default-options":17,"./add-default-options":1,"./index":8,"promise/polyfill":104}],3:[function(require,module,exports){
    var utils = require('./utils');
    module.exports = {
        createCSS: function (document, styles, sheet) {
            // Strip the query-string
            var href = sheet.href || '';
    
            // If there is no title set, use the filename, minus the extension
            var id = 'less:' + (sheet.title || utils.extractId(href));
    
            // If this has already been inserted into the DOM, we may need to replace it
            var oldStyleNode = document.getElementById(id);
            var keepOldStyleNode = false;
    
            // Create a new stylesheet node for insertion or (if necessary) replacement
            var styleNode = document.createElement('style');
            styleNode.setAttribute('type', 'text/css');
            if (sheet.media) {
                styleNode.setAttribute('media', sheet.media);
            }
            styleNode.id = id;
    
            if (!styleNode.styleSheet) {
                styleNode.appendChild(document.createTextNode(styles));
    
                // If new contents match contents of oldStyleNode, don't replace oldStyleNode
                keepOldStyleNode = (oldStyleNode !== null && oldStyleNode.childNodes.length > 0 && styleNode.childNodes.length > 0 &&
                    oldStyleNode.firstChild.nodeValue === styleNode.firstChild.nodeValue);
            }
    
            var head = document.getElementsByTagName('head')[0];
    
            // If there is no oldStyleNode, just append; otherwise, only append if we need
            // to replace oldStyleNode with an updated stylesheet
            if (oldStyleNode === null || keepOldStyleNode === false) {
                var nextEl = sheet && sheet.nextSibling || null;
                if (nextEl) {
                    nextEl.parentNode.insertBefore(styleNode, nextEl);
                } else {
                    head.appendChild(styleNode);
                }
            }
            if (oldStyleNode && keepOldStyleNode === false) {
                oldStyleNode.parentNode.removeChild(oldStyleNode);
            }
    
            // For IE.
            // This needs to happen *after* the style element is added to the DOM, otherwise IE 7 and 8 may crash.
            // See http://social.msdn.microsoft.com/Forums/en-US/7e081b65-878a-4c22-8e68-c10d39c2ed32/internet-explorer-crashes-appending-style-element-to-head
            if (styleNode.styleSheet) {
                try {
                    styleNode.styleSheet.cssText = styles;
                } catch (e) {
                    throw new Error('Couldn\'t reassign styleSheet.cssText.');
                }
            }
        },
        currentScript: function(window) {
            var document = window.document;
            return document.currentScript || (function() {
                var scripts = document.getElementsByTagName('script');
                return scripts[scripts.length - 1];
            })();
        }
    };
    
    },{"./utils":11}],4:[function(require,module,exports){
    // Cache system is a bit outdated and could do with work
    
    module.exports = function(window, options, logger) {
        var cache = null;
        if (options.env !== 'development') {
            try {
                cache = (typeof window.localStorage === 'undefined') ? null : window.localStorage;
            } catch (_) {}
        }
        return {
            setCSS: function(path, lastModified, modifyVars, styles) {
                if (cache) {
                    logger.info('saving ' + path + ' to cache.');
                    try {
                        cache.setItem(path, styles);
                        cache.setItem(path + ':timestamp', lastModified);
                        if (modifyVars) {
                            cache.setItem(path + ':vars', JSON.stringify(modifyVars));
                        }
                    } catch (e) {
                        // TODO - could do with adding more robust error handling
                        logger.error('failed to save "' + path + '" to local storage for caching.');
                    }
                }
            },
            getCSS: function(path, webInfo, modifyVars) {
                var css       = cache && cache.getItem(path),
                    timestamp = cache && cache.getItem(path + ':timestamp'),
                    vars      = cache && cache.getItem(path + ':vars');
    
                modifyVars = modifyVars || {};
                vars = vars || "{}"; // if not set, treat as the JSON representation of an empty object
    
                if (timestamp && webInfo.lastModified &&
                    (new Date(webInfo.lastModified).valueOf() ===
                        new Date(timestamp).valueOf()) &&
                    JSON.stringify(modifyVars) === vars) {
                    // Use local copy
                    return css;
                }
            }
        };
    };
    
    },{}],5:[function(require,module,exports){
    var utils = require('./utils'),
        browser = require('./browser');
    
    module.exports = function(window, less, options) {
    
        function errorHTML(e, rootHref) {
            var id = 'less-error-message:' + utils.extractId(rootHref || '');
            var template = '<li><label>{line}</label><pre class="{class}">{content}</pre></li>';
            var elem = window.document.createElement('div'), timer, content, errors = [];
            var filename = e.filename || rootHref;
            var filenameNoPath = filename.match(/([^\/]+(\?.*)?)$/)[1];
    
            elem.id        = id;
            elem.className = 'less-error-message';
    
            content = '<h3>'  + (e.type || 'Syntax') + 'Error: ' + (e.message || 'There is an error in your .less file') +
                '</h3>' + '<p>in <a href="' + filename   + '">' + filenameNoPath + '</a> ';
    
            var errorline = function (e, i, classname) {
                if (e.extract[i] !== undefined) {
                    errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
                        .replace(/\{class\}/, classname)
                        .replace(/\{content\}/, e.extract[i]));
                }
            };
    
            if (e.line) {
                errorline(e, 0, '');
                errorline(e, 1, 'line');
                errorline(e, 2, '');
                content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':</p>' +
                    '<ul>' + errors.join('') + '</ul>';
            }
            if (e.stack && (e.extract || options.logLevel >= 4)) {
                content += '<br/>Stack Trace</br />' + e.stack.split('\n').slice(1).join('<br/>');
            }
            elem.innerHTML = content;
    
            // CSS for error messages
            browser.createCSS(window.document, [
                '.less-error-message ul, .less-error-message li {',
                'list-style-type: none;',
                'margin-right: 15px;',
                'padding: 4px 0;',
                'margin: 0;',
                '}',
                '.less-error-message label {',
                'font-size: 12px;',
                'margin-right: 15px;',
                'padding: 4px 0;',
                'color: #cc7777;',
                '}',
                '.less-error-message pre {',
                'color: #dd6666;',
                'padding: 4px 0;',
                'margin: 0;',
                'display: inline-block;',
                '}',
                '.less-error-message pre.line {',
                'color: #ff0000;',
                '}',
                '.less-error-message h3 {',
                'font-size: 20px;',
                'font-weight: bold;',
                'padding: 15px 0 5px 0;',
                'margin: 0;',
                '}',
                '.less-error-message a {',
                'color: #10a',
                '}',
                '.less-error-message .error {',
                'color: red;',
                'font-weight: bold;',
                'padding-bottom: 2px;',
                'border-bottom: 1px dashed red;',
                '}'
            ].join('\n'), { title: 'error-message' });
    
            elem.style.cssText = [
                'font-family: Arial, sans-serif',
                'border: 1px solid #e00',
                'background-color: #eee',
                'border-radius: 5px',
                '-webkit-border-radius: 5px',
                '-moz-border-radius: 5px',
                'color: #e00',
                'padding: 15px',
                'margin-bottom: 15px'
            ].join(';');
    
            if (options.env === 'development') {
                timer = setInterval(function () {
                    var document = window.document,
                        body = document.body;
                    if (body) {
                        if (document.getElementById(id)) {
                            body.replaceChild(elem, document.getElementById(id));
                        } else {
                            body.insertBefore(elem, body.firstChild);
                        }
                        clearInterval(timer);
                    }
                }, 10);
            }
        }
    
        function removeErrorHTML(path) {
            var node = window.document.getElementById('less-error-message:' + utils.extractId(path));
            if (node) {
                node.parentNode.removeChild(node);
            }
        }
    
        function removeErrorConsole(path) {
            // no action
        }
    
        function removeError(path) {
            if (!options.errorReporting || options.errorReporting === 'html') {
                removeErrorHTML(path);
            } else if (options.errorReporting === 'console') {
                removeErrorConsole(path);
            } else if (typeof options.errorReporting === 'function') {
                options.errorReporting('remove', path);
            }
        }
    
        function errorConsole(e, rootHref) {
            var template = '{line} {content}';
            var filename = e.filename || rootHref;
            var errors = [];
            var content = (e.type || 'Syntax') + 'Error: ' + (e.message || 'There is an error in your .less file') +
                ' in ' + filename;
    
            var errorline = function (e, i, classname) {
                if (e.extract[i] !== undefined) {
                    errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
                        .replace(/\{class\}/, classname)
                        .replace(/\{content\}/, e.extract[i]));
                }
            };
    
            if (e.line) {
                errorline(e, 0, '');
                errorline(e, 1, 'line');
                errorline(e, 2, '');
                content += ' on line ' + e.line + ', column ' + (e.column + 1) + ':\n' +
                    errors.join('\n');
            }
            if (e.stack && (e.extract || options.logLevel >= 4)) {
                content += '\nStack Trace\n' + e.stack;
            }
            less.logger.error(content);
        }
    
        function error(e, rootHref) {
            if (!options.errorReporting || options.errorReporting === 'html') {
                errorHTML(e, rootHref);
            } else if (options.errorReporting === 'console') {
                errorConsole(e, rootHref);
            } else if (typeof options.errorReporting === 'function') {
                options.errorReporting('add', e, rootHref);
            }
        }
    
        return {
            add: error,
            remove: removeError
        };
    };
    
    },{"./browser":3,"./utils":11}],6:[function(require,module,exports){
    /* global window, XMLHttpRequest */
    
    module.exports = function(options, logger) {
    
        var AbstractFileManager = require('../less/environment/abstract-file-manager.js');
    
        var fileCache = {};
    
        // TODOS - move log somewhere. pathDiff and doing something similar in node. use pathDiff in the other browser file for the initial load
        var FileManager = function() {
        };
    
        FileManager.prototype = new AbstractFileManager();
    
        FileManager.prototype.alwaysMakePathsAbsolute = function alwaysMakePathsAbsolute() {
            return true;
        };
        FileManager.prototype.join = function join(basePath, laterPath) {
            if (!basePath) {
                return laterPath;
            }
            return this.extractUrlParts(laterPath, basePath).path;
        };
        FileManager.prototype.doXHR = function doXHR(url, type, callback, errback) {
    
            var xhr = new XMLHttpRequest();
            var async = options.isFileProtocol ? options.fileAsync : true;
    
            if (typeof xhr.overrideMimeType === 'function') {
                xhr.overrideMimeType('text/css');
            }
            logger.debug('XHR: Getting \'' + url + '\'');
            xhr.open('GET', url, async);
            xhr.setRequestHeader('Accept', type || 'text/x-less, text/css; q=0.9, */*; q=0.5');
            xhr.send(null);
    
            function handleResponse(xhr, callback, errback) {
                if (xhr.status >= 200 && xhr.status < 300) {
                    callback(xhr.responseText,
                        xhr.getResponseHeader('Last-Modified'));
                } else if (typeof errback === 'function') {
                    errback(xhr.status, url);
                }
            }
    
            if (options.isFileProtocol && !options.fileAsync) {
                if (xhr.status === 0 || (xhr.status >= 200 && xhr.status < 300)) {
                    callback(xhr.responseText);
                } else {
                    errback(xhr.status, url);
                }
            } else if (async) {
                xhr.onreadystatechange = function () {
                    if (xhr.readyState == 4) {
                        handleResponse(xhr, callback, errback);
                    }
                };
            } else {
                handleResponse(xhr, callback, errback);
            }
        };
        FileManager.prototype.supports = function(filename, currentDirectory, options, environment) {
            return true;
        };
    
        FileManager.prototype.clearFileCache = function() {
            fileCache = {};
        };
    
        FileManager.prototype.loadFile = function loadFile(filename, currentDirectory, options, environment) {
            // TODO: Add prefix support like less-node?
            // What about multiple paths?
    
            if (currentDirectory && !this.isPathAbsolute(filename)) {
                filename = currentDirectory + filename;
            }
    
            filename = options.ext ? this.tryAppendExtension(filename, options.ext) : filename;
    
            options = options || {};
    
            // sheet may be set to the stylesheet for the initial load or a collection of properties including
            // some context variables for imports
            var hrefParts = this.extractUrlParts(filename, window.location.href);
            var href      = hrefParts.url;
            var self      = this;
            
            return new Promise(function(resolve, reject) {
                if (options.useFileCache && fileCache[href]) {
                    try {
                        var lessText = fileCache[href];
                        return resolve({ contents: lessText, filename: href, webInfo: { lastModified: new Date() }});
                    } catch (e) {
                        return reject({ filename: href, message: 'Error loading file ' + href + ' error was ' + e.message });
                    }
                }
    
                self.doXHR(href, options.mime, function doXHRCallback(data, lastModified) {
                    // per file cache
                    fileCache[href] = data;
    
                    // Use remote copy (re-parse)
                    resolve({ contents: data, filename: href, webInfo: { lastModified: lastModified }});
                }, function doXHRError(status, url) {
                    reject({ type: 'File', message: '\'' + url + '\' wasn\'t found (' + status + ')', href: href });
                });
            });
        };
    
        return FileManager;
    };
    
    },{"../less/environment/abstract-file-manager.js":18}],7:[function(require,module,exports){
    module.exports = function() {
    
        var functionRegistry = require('./../less/functions/function-registry');
    
        function imageSize() {
            throw {
                type: 'Runtime',
                message: 'Image size functions are not supported in browser version of less'
            };
        }
    
        var imageFunctions = {
            'image-size': function(filePathNode) {
                imageSize(this, filePathNode);
                return -1;
            },
            'image-width': function(filePathNode) {
                imageSize(this, filePathNode);
                return -1;
            },
            'image-height': function(filePathNode) {
                imageSize(this, filePathNode);
                return -1;
            }
        };
    
        functionRegistry.addMultiple(imageFunctions);
    };
    
    },{"./../less/functions/function-registry":27}],8:[function(require,module,exports){
    //
    // index.js
    // Should expose the additional browser functions on to the less object
    //
    var addDataAttr = require('./utils').addDataAttr,
        browser = require('./browser');
    
    module.exports = function(window, options) {
        var document = window.document;
        var less = require('../less')();
        
        less.options = options;
        var environment = less.environment,
            FileManager = require('./file-manager')(options, less.logger),
            fileManager = new FileManager();
        environment.addFileManager(fileManager);
        less.FileManager = FileManager;
        less.PluginLoader = require('./plugin-loader');
    
        require('./log-listener')(less, options);
        var errors = require('./error-reporting')(window, less, options);
        var cache = less.cache = options.cache || require('./cache')(window, options, less.logger);
        require('./image-size')(less.environment);
    
        // Setup user functions - Deprecate?
        if (options.functions) {
            less.functions.functionRegistry.addMultiple(options.functions);
        }
    
        var typePattern = /^text\/(x-)?less$/;
    
        function clone(obj) {
            var cloned = {};
            for (var prop in obj) {
                if (obj.hasOwnProperty(prop)) {
                    cloned[prop] = obj[prop];
                }
            }
            return cloned;
        }
    
        // only really needed for phantom
        function bind(func, thisArg) {
            var curryArgs = Array.prototype.slice.call(arguments, 2);
            return function() {
                var args = curryArgs.concat(Array.prototype.slice.call(arguments, 0));
                return func.apply(thisArg, args);
            };
        }
    
        function loadStyles(modifyVars) {
            var styles = document.getElementsByTagName('style'),
                style;
    
            for (var i = 0; i < styles.length; i++) {
                style = styles[i];
                if (style.type.match(typePattern)) {
                    var instanceOptions = clone(options);
                    instanceOptions.modifyVars = modifyVars;
                    var lessText = style.innerHTML || '';
                    instanceOptions.filename = document.location.href.replace(/#.*$/, '');
    
                    /* jshint loopfunc:true */
                    // use closure to store current style
                    less.render(lessText, instanceOptions,
                            bind(function(style, e, result) {
                                if (e) {
                                    errors.add(e, 'inline');
                                } else {
                                    style.type = 'text/css';
                                    if (style.styleSheet) {
                                        style.styleSheet.cssText = result.css;
                                    } else {
                                        style.innerHTML = result.css;
                                    }
                                }
                            }, null, style));
                }
            }
        }
    
        function loadStyleSheet(sheet, callback, reload, remaining, modifyVars) {
    
            var instanceOptions = clone(options);
            addDataAttr(instanceOptions, sheet);
            instanceOptions.mime = sheet.type;
    
            if (modifyVars) {
                instanceOptions.modifyVars = modifyVars;
            }
    
            function loadInitialFileCallback(loadedFile) {
    
                var data = loadedFile.contents,
                    path = loadedFile.filename,
                    webInfo = loadedFile.webInfo;
    
                var newFileInfo = {
                    currentDirectory: fileManager.getPath(path),
                    filename: path,
                    rootFilename: path,
                    rewriteUrls: instanceOptions.rewriteUrls
                };
    
                newFileInfo.entryPath = newFileInfo.currentDirectory;
                newFileInfo.rootpath = instanceOptions.rootpath || newFileInfo.currentDirectory;
    
                if (webInfo) {
                    webInfo.remaining = remaining;
    
                    var css = cache.getCSS(path, webInfo, instanceOptions.modifyVars);
                    if (!reload && css) {
                        webInfo.local = true;
                        callback(null, css, data, sheet, webInfo, path);
                        return;
                    }
    
                }
    
                // TODO add tests around how this behaves when reloading
                errors.remove(path);
    
                instanceOptions.rootFileInfo = newFileInfo;
                less.render(data, instanceOptions, function(e, result) {
                    if (e) {
                        e.href = path;
                        callback(e);
                    } else {
                        cache.setCSS(sheet.href, webInfo.lastModified, instanceOptions.modifyVars, result.css);
                        callback(null, result.css, data, sheet, webInfo, path);
                    }
                });
            }
    
            fileManager.loadFile(sheet.href, null, instanceOptions, environment)
                .then(function(loadedFile) {
                    loadInitialFileCallback(loadedFile);
                }).catch(function(err) {
                    console.log(err);
                    callback(err);
                });
    
        }
    
        function loadStyleSheets(callback, reload, modifyVars) {
            for (var i = 0; i < less.sheets.length; i++) {
                loadStyleSheet(less.sheets[i], callback, reload, less.sheets.length - (i + 1), modifyVars);
            }
        }
    
        function initRunningMode() {
            if (less.env === 'development') {
                less.watchTimer = setInterval(function () {
                    if (less.watchMode) {
                        fileManager.clearFileCache();
                        loadStyleSheets(function (e, css, _, sheet, webInfo) {
                            if (e) {
                                errors.add(e, e.href || sheet.href);
                            } else if (css) {
                                browser.createCSS(window.document, css, sheet);
                            }
                        });
                    }
                }, options.poll);
            }
        }
    
        //
        // Watch mode
        //
        less.watch   = function () {
            if (!less.watchMode ) {
                less.env = 'development';
                initRunningMode();
            }
            this.watchMode = true;
            return true;
        };
    
        less.unwatch = function () {clearInterval(less.watchTimer); this.watchMode = false; return false; };
    
        //
        // Synchronously get all <link> tags with the 'rel' attribute set to
        // "stylesheet/less".
        //
        less.registerStylesheetsImmediately = function() {
            var links = document.getElementsByTagName('link');
            less.sheets = [];
    
            for (var i = 0; i < links.length; i++) {
                if (links[i].rel === 'stylesheet/less' || (links[i].rel.match(/stylesheet/) &&
                    (links[i].type.match(typePattern)))) {
                    less.sheets.push(links[i]);
                }
            }
        };
    
        //
        // Asynchronously get all <link> tags with the 'rel' attribute set to
        // "stylesheet/less", returning a Promise.
        //
        less.registerStylesheets = function() {
            return new Promise(function(resolve, reject) {
                less.registerStylesheetsImmediately();
                resolve();
            });
        };
    
        //
        // With this function, it's possible to alter variables and re-render
        // CSS without reloading less-files
        //
        less.modifyVars = function(record) {
            return less.refresh(true, record, false);
        };
    
        less.refresh = function (reload, modifyVars, clearFileCache) {
            if ((reload || clearFileCache) && clearFileCache !== false) {
                fileManager.clearFileCache();
            }
            return new Promise(function (resolve, reject) {
                var startTime, endTime, totalMilliseconds, remainingSheets;
                startTime = endTime = new Date();
    
                // Set counter for remaining unprocessed sheets
                remainingSheets = less.sheets.length;
    
                if (remainingSheets === 0) {
    
                    endTime = new Date();
                    totalMilliseconds = endTime - startTime;
                    less.logger.info('Less has finished and no sheets were loaded.');
                    resolve({
                        startTime: startTime,
                        endTime: endTime,
                        totalMilliseconds: totalMilliseconds,
                        sheets: less.sheets.length
                    });
    
                } else {
                    // Relies on less.sheets array, callback seems to be guaranteed to be called for every element of the array
                    loadStyleSheets(function (e, css, _, sheet, webInfo) {
                        if (e) {
                            errors.add(e, e.href || sheet.href);
                            reject(e);
                            return;
                        }
                        if (webInfo.local) {
                            less.logger.info('Loading ' + sheet.href + ' from cache.');
                        } else {
                            less.logger.info('Rendered ' + sheet.href + ' successfully.');
                        }
                        browser.createCSS(window.document, css, sheet);
                        less.logger.info('CSS for ' + sheet.href + ' generated in ' + (new Date() - endTime) + 'ms');
    
                        // Count completed sheet
                        remainingSheets--;
    
                        // Check if the last remaining sheet was processed and then call the promise
                        if (remainingSheets === 0) {
                            totalMilliseconds = new Date() - startTime;
                            less.logger.info('Less has finished. CSS generated in ' + totalMilliseconds + 'ms');
                            resolve({
                                startTime: startTime,
                                endTime: endTime,
                                totalMilliseconds: totalMilliseconds,
                                sheets: less.sheets.length
                            });
                        }
                        endTime = new Date();
                    }, reload, modifyVars);
                }
    
                loadStyles(modifyVars);
            });
        };
    
        less.refreshStyles = loadStyles;
        return less;
    };
    
    },{"../less":37,"./browser":3,"./cache":4,"./error-reporting":5,"./file-manager":6,"./image-size":7,"./log-listener":9,"./plugin-loader":10,"./utils":11}],9:[function(require,module,exports){
    module.exports = function(less, options) {
    
        var logLevel_debug = 4,
            logLevel_info = 3,
            logLevel_warn = 2,
            logLevel_error = 1;
    
        // The amount of logging in the javascript console.
        // 3 - Debug, information and errors
        // 2 - Information and errors
        // 1 - Errors
        // 0 - None
        // Defaults to 2
        options.logLevel = typeof options.logLevel !== 'undefined' ? options.logLevel : (options.env === 'development' ?  logLevel_info : logLevel_error);
    
        if (!options.loggers) {
            options.loggers = [{
                debug: function(msg) {
                    if (options.logLevel >= logLevel_debug) {
                        console.log(msg);
                    }
                },
                info: function(msg) {
                    if (options.logLevel >= logLevel_info) {
                        console.log(msg);
                    }
                },
                warn: function(msg) {
                    if (options.logLevel >= logLevel_warn) {
                        console.warn(msg);
                    }
                },
                error: function(msg) {
                    if (options.logLevel >= logLevel_error) {
                        console.error(msg);
                    }
                }
            }];
        }
        for (var i = 0; i < options.loggers.length; i++) {
            less.logger.addListener(options.loggers[i]);
        }
    };
    
    },{}],10:[function(require,module,exports){
    // TODO: Add tests for browser @plugin
    /* global window */
    
    var AbstractPluginLoader = require('../less/environment/abstract-plugin-loader.js');
    
    /**
     * Browser Plugin Loader
     */
    var PluginLoader = function(less) {
        this.less = less;
        // Should we shim this.require for browser? Probably not?
    };
    
    PluginLoader.prototype = new AbstractPluginLoader();
    
    PluginLoader.prototype.loadPlugin = function(filename, basePath, context, environment, fileManager) {
        return new Promise(function(fulfill, reject) {
            fileManager.loadFile(filename, basePath, context, environment)
                .then(fulfill).catch(reject);
        });
    };
    
    module.exports = PluginLoader;
    
    
    },{"../less/environment/abstract-plugin-loader.js":19}],11:[function(require,module,exports){
    module.exports = {
        extractId: function(href) {
            return href.replace(/^[a-z-]+:\/+?[^\/]+/, '')  // Remove protocol & domain
                .replace(/[\?\&]livereload=\w+/, '')        // Remove LiveReload cachebuster
                .replace(/^\//, '')                         // Remove root /
                .replace(/\.[a-zA-Z]+$/, '')                // Remove simple extension
                .replace(/[^\.\w-]+/g, '-')                 // Replace illegal characters
                .replace(/\./g, ':');                       // Replace dots with colons(for valid id)
        },
        addDataAttr: function(options, tag) {
            for (var opt in tag.dataset) {
                if (tag.dataset.hasOwnProperty(opt)) {
                    if (opt === 'env' || opt === 'dumpLineNumbers' || opt === 'rootpath' || opt === 'errorReporting') {
                        options[opt] = tag.dataset[opt];
                    } else {
                        try {
                            options[opt] = JSON.parse(tag.dataset[opt]);
                        }
                        catch (_) {}
                    }
                }
            }
        }
    };
    
    },{}],12:[function(require,module,exports){
    module.exports = {
        Math: {
            ALWAYS: 0,
            PARENS_DIVISION: 1,
            PARENS: 2,
            STRICT_LEGACY: 3
        },
        RewriteUrls: {
            OFF: 0,
            LOCAL: 1,
            ALL: 2
        }
    };
    },{}],13:[function(require,module,exports){
    var contexts = {};
    module.exports = contexts;
    var Constants = require('./constants');
    
    var copyFromOriginal = function copyFromOriginal(original, destination, propertiesToCopy) {
        if (!original) { return; }
    
        for (var i = 0; i < propertiesToCopy.length; i++) {
            if (original.hasOwnProperty(propertiesToCopy[i])) {
                destination[propertiesToCopy[i]] = original[propertiesToCopy[i]];
            }
        }
    };
    
    /*
     parse is used whilst parsing
     */
    var parseCopyProperties = [
        // options
        'paths',            // option - unmodified - paths to search for imports on
        'rewriteUrls',      // option - whether to adjust URL's to be relative
        'rootpath',         // option - rootpath to append to URL's
        'strictImports',    // option -
        'insecure',         // option - whether to allow imports from insecure ssl hosts
        'dumpLineNumbers',  // option - whether to dump line numbers
        'compress',         // option - whether to compress
        'syncImport',       // option - whether to import synchronously
        'chunkInput',       // option - whether to chunk input. more performant but causes parse issues.
        'mime',             // browser only - mime type for sheet import
        'useFileCache',     // browser only - whether to use the per file session cache
        // context
        'processImports',   // option & context - whether to process imports. if false then imports will not be imported.
                            // Used by the import manager to stop multiple import visitors being created.
        'pluginManager'     // Used as the plugin manager for the session
    ];
    
    contexts.Parse = function(options) {
        copyFromOriginal(options, this, parseCopyProperties);
    
        if (typeof this.paths === 'string') { this.paths = [this.paths]; }
    };
    
    var evalCopyProperties = [
        'paths',             // additional include paths
        'compress',          // whether to compress
        'ieCompat',          // whether to enforce IE compatibility (IE8 data-uri)
        'math',              // whether math has to be within parenthesis
        'strictUnits',       // whether units need to evaluate correctly
        'sourceMap',         // whether to output a source map
        'importMultiple',    // whether we are currently importing multiple copies
        'urlArgs',           // whether to add args into url tokens
        'javascriptEnabled', // option - whether Inline JavaScript is enabled. if undefined, defaults to false
        'pluginManager',     // Used as the plugin manager for the session
        'importantScope',    // used to bubble up !important statements
        'rewriteUrls'        // option - whether to adjust URL's to be relative
    ];
    
    contexts.Eval = function(options, frames) {
        copyFromOriginal(options, this, evalCopyProperties);
    
        if (typeof this.paths === 'string') { this.paths = [this.paths]; }
    
        this.frames = frames || [];
        this.importantScope = this.importantScope || [];
    };
    
    contexts.Eval.prototype.enterCalc = function () {
        if (!this.calcStack) {
            this.calcStack = [];
        }
        this.calcStack.push(true);
        this.inCalc = true;
    };
    
    contexts.Eval.prototype.exitCalc = function () {
        this.calcStack.pop();
        if (!this.calcStack) {
            this.inCalc = false;
        }
    };
    
    contexts.Eval.prototype.inParenthesis = function () {
        if (!this.parensStack) {
            this.parensStack = [];
        }
        this.parensStack.push(true);
    };
    
    contexts.Eval.prototype.outOfParenthesis = function () {
        this.parensStack.pop();
    };
    
    contexts.Eval.prototype.inCalc = false;
    contexts.Eval.prototype.mathOn = true;
    contexts.Eval.prototype.isMathOn = function (op) {
        if (!this.mathOn) {
            return false;
        }
        if (op === '/' && this.math !== Constants.Math.ALWAYS && (!this.parensStack || !this.parensStack.length)) {
            return false;
        }
        if (this.math > Constants.Math.PARENS_DIVISION) {
            return this.parensStack && this.parensStack.length;
        }
        return true;
    };
    
    contexts.Eval.prototype.pathRequiresRewrite = function (path) {
        var isRelative = this.rewriteUrls === Constants.RewriteUrls.LOCAL ? isPathLocalRelative : isPathRelative;
    
        return isRelative(path);
    };
    
    contexts.Eval.prototype.rewritePath = function (path, rootpath) {
        var newPath;
    
        rootpath = rootpath || '';
        newPath = this.normalizePath(rootpath + path);
    
        // If a path was explicit relative and the rootpath was not an absolute path
        // we must ensure that the new path is also explicit relative.
        if (isPathLocalRelative(path) &&
            isPathRelative(rootpath) &&
            isPathLocalRelative(newPath) === false) {
            newPath = './' + newPath;
        }
    
        return newPath;
    };
    
    contexts.Eval.prototype.normalizePath = function (path) {
        var
            segments = path.split('/').reverse(),
            segment;
    
        path = [];
        while (segments.length !== 0) {
            segment = segments.pop();
            switch ( segment ) {
                case '.':
                    break;
                case '..':
                    if ((path.length === 0) || (path[path.length - 1] === '..')) {
                        path.push( segment );
                    } else {
                        path.pop();
                    }
                    break;
                default:
                    path.push(segment);
                    break;
            }
        }
    
        return path.join('/');
    };
    
    function isPathRelative(path) {
        return !/^(?:[a-z-]+:|\/|#)/i.test(path);
    }
    
    function isPathLocalRelative(path) {
        return path.charAt(0) === '.';
    }
    
    // todo - do the same for the toCSS ?
    
    },{"./constants":12}],14:[function(require,module,exports){
    module.exports = {
        'aliceblue':'#f0f8ff',
        'antiquewhite':'#faebd7',
        'aqua':'#00ffff',
        'aquamarine':'#7fffd4',
        'azure':'#f0ffff',
        'beige':'#f5f5dc',
        'bisque':'#ffe4c4',
        'black':'#000000',
        'blanchedalmond':'#ffebcd',
        'blue':'#0000ff',
        'blueviolet':'#8a2be2',
        'brown':'#a52a2a',
        'burlywood':'#deb887',
        'cadetblue':'#5f9ea0',
        'chartreuse':'#7fff00',
        'chocolate':'#d2691e',
        'coral':'#ff7f50',
        'cornflowerblue':'#6495ed',
        'cornsilk':'#fff8dc',
        'crimson':'#dc143c',
        'cyan':'#00ffff',
        'darkblue':'#00008b',
        'darkcyan':'#008b8b',
        'darkgoldenrod':'#b8860b',
        'darkgray':'#a9a9a9',
        'darkgrey':'#a9a9a9',
        'darkgreen':'#006400',
        'darkkhaki':'#bdb76b',
        'darkmagenta':'#8b008b',
        'darkolivegreen':'#556b2f',
        'darkorange':'#ff8c00',
        'darkorchid':'#9932cc',
        'darkred':'#8b0000',
        'darksalmon':'#e9967a',
        'darkseagreen':'#8fbc8f',
        'darkslateblue':'#483d8b',
        'darkslategray':'#2f4f4f',
        'darkslategrey':'#2f4f4f',
        'darkturquoise':'#00ced1',
        'darkviolet':'#9400d3',
        'deeppink':'#ff1493',
        'deepskyblue':'#00bfff',
        'dimgray':'#696969',
        'dimgrey':'#696969',
        'dodgerblue':'#1e90ff',
        'firebrick':'#b22222',
        'floralwhite':'#fffaf0',
        'forestgreen':'#228b22',
        'fuchsia':'#ff00ff',
        'gainsboro':'#dcdcdc',
        'ghostwhite':'#f8f8ff',
        'gold':'#ffd700',
        'goldenrod':'#daa520',
        'gray':'#808080',
        'grey':'#808080',
        'green':'#008000',
        'greenyellow':'#adff2f',
        'honeydew':'#f0fff0',
        'hotpink':'#ff69b4',
        'indianred':'#cd5c5c',
        'indigo':'#4b0082',
        'ivory':'#fffff0',
        'khaki':'#f0e68c',
        'lavender':'#e6e6fa',
        'lavenderblush':'#fff0f5',
        'lawngreen':'#7cfc00',
        'lemonchiffon':'#fffacd',
        'lightblue':'#add8e6',
        'lightcoral':'#f08080',
        'lightcyan':'#e0ffff',
        'lightgoldenrodyellow':'#fafad2',
        'lightgray':'#d3d3d3',
        'lightgrey':'#d3d3d3',
        'lightgreen':'#90ee90',
        'lightpink':'#ffb6c1',
        'lightsalmon':'#ffa07a',
        'lightseagreen':'#20b2aa',
        'lightskyblue':'#87cefa',
        'lightslategray':'#778899',
        'lightslategrey':'#778899',
        'lightsteelblue':'#b0c4de',
        'lightyellow':'#ffffe0',
        'lime':'#00ff00',
        'limegreen':'#32cd32',
        'linen':'#faf0e6',
        'magenta':'#ff00ff',
        'maroon':'#800000',
        'mediumaquamarine':'#66cdaa',
        'mediumblue':'#0000cd',
        'mediumorchid':'#ba55d3',
        'mediumpurple':'#9370d8',
        'mediumseagreen':'#3cb371',
        'mediumslateblue':'#7b68ee',
        'mediumspringgreen':'#00fa9a',
        'mediumturquoise':'#48d1cc',
        'mediumvioletred':'#c71585',
        'midnightblue':'#191970',
        'mintcream':'#f5fffa',
        'mistyrose':'#ffe4e1',
        'moccasin':'#ffe4b5',
        'navajowhite':'#ffdead',
        'navy':'#000080',
        'oldlace':'#fdf5e6',
        'olive':'#808000',
        'olivedrab':'#6b8e23',
        'orange':'#ffa500',
        'orangered':'#ff4500',
        'orchid':'#da70d6',
        'palegoldenrod':'#eee8aa',
        'palegreen':'#98fb98',
        'paleturquoise':'#afeeee',
        'palevioletred':'#d87093',
        'papayawhip':'#ffefd5',
        'peachpuff':'#ffdab9',
        'peru':'#cd853f',
        'pink':'#ffc0cb',
        'plum':'#dda0dd',
        'powderblue':'#b0e0e6',
        'purple':'#800080',
        'rebeccapurple':'#663399',
        'red':'#ff0000',
        'rosybrown':'#bc8f8f',
        'royalblue':'#4169e1',
        'saddlebrown':'#8b4513',
        'salmon':'#fa8072',
        'sandybrown':'#f4a460',
        'seagreen':'#2e8b57',
        'seashell':'#fff5ee',
        'sienna':'#a0522d',
        'silver':'#c0c0c0',
        'skyblue':'#87ceeb',
        'slateblue':'#6a5acd',
        'slategray':'#708090',
        'slategrey':'#708090',
        'snow':'#fffafa',
        'springgreen':'#00ff7f',
        'steelblue':'#4682b4',
        'tan':'#d2b48c',
        'teal':'#008080',
        'thistle':'#d8bfd8',
        'tomato':'#ff6347',
        'turquoise':'#40e0d0',
        'violet':'#ee82ee',
        'wheat':'#f5deb3',
        'white':'#ffffff',
        'whitesmoke':'#f5f5f5',
        'yellow':'#ffff00',
        'yellowgreen':'#9acd32'
    };
    },{}],15:[function(require,module,exports){
    module.exports = {
        colors: require('./colors'),
        unitConversions: require('./unit-conversions')
    };
    
    },{"./colors":14,"./unit-conversions":16}],16:[function(require,module,exports){
    module.exports = {
        length: {
            'm': 1,
            'cm': 0.01,
            'mm': 0.001,
            'in': 0.0254,
            'px': 0.0254 / 96,
            'pt': 0.0254 / 72,
            'pc': 0.0254 / 72 * 12
        },
        duration: {
            's': 1,
            'ms': 0.001
        },
        angle: {
            'rad': 1 / (2 * Math.PI),
            'deg': 1 / 360,
            'grad': 1 / 400,
            'turn': 1
        }
    };
    },{}],17:[function(require,module,exports){
    // Export a new default each time
    module.exports = function() {
        return {
            /* Inline Javascript - @plugin still allowed */
            javascriptEnabled: false,
    
            /* Outputs a makefile import dependency list to stdout. */
            depends: false,
    
            /* (DEPRECATED) Compress using less built-in compression. 
             * This does an okay job but does not utilise all the tricks of 
             * dedicated css compression. */
            compress: false,
    
            /* Runs the less parser and just reports errors without any output. */
            lint: false,
    
            /* Sets available include paths.
             * If the file in an @import rule does not exist at that exact location, 
             * less will look for it at the location(s) passed to this option. 
             * You might use this for instance to specify a path to a library which 
             * you want to be referenced simply and relatively in the less files. */
            paths: [],
    
            /* color output in the terminal */
            color: true,
    
            /* The strictImports controls whether the compiler will allow an @import inside of either 
             * @media blocks or (a later addition) other selector blocks.
             * See: https://github.com/less/less.js/issues/656 */
            strictImports: false,
    
            /* Allow Imports from Insecure HTTPS Hosts */
            insecure: false,
    
            /* Allows you to add a path to every generated import and url in your css. 
             * This does not affect less import statements that are processed, just ones 
             * that are left in the output css. */
            rootpath: '',
    
            /* By default URLs are kept as-is, so if you import a file in a sub-directory 
             * that references an image, exactly the same URL will be output in the css. 
             * This option allows you to re-write URL's in imported files so that the 
             * URL is always relative to the base imported file */
            rewriteUrls: false,
    
            /* Compatibility with IE8. Used for limiting data-uri length */
            ieCompat: false,  // true until 3.0
    
            /* How to process math 
             *   0 always           - eagerly try to solve all operations
             *   1 parens-division  - require parens for division "/"
             *   2 parens | strict  - require parens for all operations
             *   3 strict-legacy    - legacy strict behavior (super-strict)
             */
            math: 0,
    
            /* Without this option, less attempts to guess at the output unit when it does maths. */
            strictUnits: false,
    
            /* Effectively the declaration is put at the top of your base Less file, 
             * meaning it can be used but it also can be overridden if this variable 
             * is defined in the file. */
            globalVars: null,
    
            /* As opposed to the global variable option, this puts the declaration at the
             * end of your base file, meaning it will override anything defined in your Less file. */
            modifyVars: null,
    
            /* This option allows you to specify a argument to go on to every URL.  */
            urlArgs: ''
        }
    }
    },{}],18:[function(require,module,exports){
    var abstractFileManager = function() {
    };
    
    abstractFileManager.prototype.getPath = function (filename) {
        var j = filename.lastIndexOf('?');
        if (j > 0) {
            filename = filename.slice(0, j);
        }
        j = filename.lastIndexOf('/');
        if (j < 0) {
            j = filename.lastIndexOf('\\');
        }
        if (j < 0) {
            return '';
        }
        return filename.slice(0, j + 1);
    };
    
    abstractFileManager.prototype.tryAppendExtension = function(path, ext) {
        return /(\.[a-z]*$)|([\?;].*)$/.test(path) ? path : path + ext;
    };
    
    abstractFileManager.prototype.tryAppendLessExtension = function(path) {
        return this.tryAppendExtension(path, '.less');
    };
    
    abstractFileManager.prototype.supportsSync = function() {
        return false;
    };
    
    abstractFileManager.prototype.alwaysMakePathsAbsolute = function() {
        return false;
    };
    
    abstractFileManager.prototype.isPathAbsolute = function(filename) {
        return (/^(?:[a-z-]+:|\/|\\|#)/i).test(filename);
    };
    // TODO: pull out / replace?
    abstractFileManager.prototype.join = function(basePath, laterPath) {
        if (!basePath) {
            return laterPath;
        }
        return basePath + laterPath;
    };
    
    abstractFileManager.prototype.pathDiff = function pathDiff(url, baseUrl) {
        // diff between two paths to create a relative path
    
        var urlParts = this.extractUrlParts(url),
            baseUrlParts = this.extractUrlParts(baseUrl),
            i, max, urlDirectories, baseUrlDirectories, diff = '';
        if (urlParts.hostPart !== baseUrlParts.hostPart) {
            return '';
        }
        max = Math.max(baseUrlParts.directories.length, urlParts.directories.length);
        for (i = 0; i < max; i++) {
            if (baseUrlParts.directories[i] !== urlParts.directories[i]) { break; }
        }
        baseUrlDirectories = baseUrlParts.directories.slice(i);
        urlDirectories = urlParts.directories.slice(i);
        for (i = 0; i < baseUrlDirectories.length - 1; i++) {
            diff += '../';
        }
        for (i = 0; i < urlDirectories.length - 1; i++) {
            diff += urlDirectories[i] + '/';
        }
        return diff;
    };
    // helper function, not part of API
    abstractFileManager.prototype.extractUrlParts = function extractUrlParts(url, baseUrl) {
        // urlParts[1] = protocol://hostname/ OR /
        // urlParts[2] = / if path relative to host base
        // urlParts[3] = directories
        // urlParts[4] = filename
        // urlParts[5] = parameters
    
        var urlPartsRegex = /^((?:[a-z-]+:)?\/{2}(?:[^\/\?#]*\/)|([\/\\]))?((?:[^\/\\\?#]*[\/\\])*)([^\/\\\?#]*)([#\?].*)?$/i,
            urlParts = url.match(urlPartsRegex),
            returner = {}, rawDirectories = [], directories = [], i, baseUrlParts;
    
        if (!urlParts) {
            throw new Error('Could not parse sheet href - \'' + url + '\'');
        }
    
        // Stylesheets in IE don't always return the full path
        if (baseUrl && (!urlParts[1] || urlParts[2])) {
            baseUrlParts = baseUrl.match(urlPartsRegex);
            if (!baseUrlParts) {
                throw new Error('Could not parse page url - \'' + baseUrl + '\'');
            }
            urlParts[1] = urlParts[1] || baseUrlParts[1] || '';
            if (!urlParts[2]) {
                urlParts[3] = baseUrlParts[3] + urlParts[3];
            }
        }
    
        if (urlParts[3]) {
            rawDirectories = urlParts[3].replace(/\\/g, '/').split('/');
    
            // collapse '..' and skip '.'
            for (i = 0; i < rawDirectories.length; i++) {
    
                if (rawDirectories[i] === '..') {
                    directories.pop();
                }
                else if (rawDirectories[i] !== '.') {
                    directories.push(rawDirectories[i]);
                }
            
            }
        }
    
        returner.hostPart = urlParts[1];
        returner.directories = directories;
        returner.rawPath = (urlParts[1] || '') + rawDirectories.join('/');
        returner.path = (urlParts[1] || '') + directories.join('/');
        returner.filename = urlParts[4];
        returner.fileUrl = returner.path + (urlParts[4] || '');
        returner.url = returner.fileUrl + (urlParts[5] || '');
        return returner;
    };
    
    module.exports = abstractFileManager;
    
    },{}],19:[function(require,module,exports){
    var functionRegistry = require('../functions/function-registry'),
        LessError = require('../less-error');
    
    var AbstractPluginLoader = function() {
        // Implemented by Node.js plugin loader
        this.require = function() {
            return null;
        }
    };
    
    AbstractPluginLoader.prototype.evalPlugin = function(contents, context, imports, pluginOptions, fileInfo) {
    
        var loader,
            registry,
            pluginObj,
            localModule,
            pluginManager,
            filename,
            result;
    
        pluginManager = context.pluginManager;
    
        if (fileInfo) {
            if (typeof fileInfo === 'string') {
                filename = fileInfo;
            }
            else {
                filename = fileInfo.filename;
            }
        }
        var shortname = (new this.less.FileManager()).extractUrlParts(filename).filename;
    
        if (filename) {
            pluginObj = pluginManager.get(filename);
    
            if (pluginObj) {
                result = this.trySetOptions(pluginObj, filename, shortname, pluginOptions);
                if (result) {
                    return result;
                }
                try {
                    if (pluginObj.use) {
                        pluginObj.use.call(this.context, pluginObj);
                    }
                }
                catch (e) {
                    e.message = e.message || 'Error during @plugin call';
                    return new LessError(e, imports, filename);
                }
                return pluginObj;
            }
        }
        localModule = {
            exports: {},
            pluginManager: pluginManager,
            fileInfo: fileInfo
        };
        registry = functionRegistry.create();
    
        var registerPlugin = function(obj) {
            pluginObj = obj;
        };
    
        try {
            loader = new Function('module', 'require', 'registerPlugin', 'functions', 'tree', 'less', 'fileInfo', contents);
            loader(localModule, this.require(filename), registerPlugin, registry, this.less.tree, this.less, fileInfo);
        }
        catch (e) {
            return new LessError(e, imports, filename);
        }
    
        if (!pluginObj) {
            pluginObj = localModule.exports;
        }
        pluginObj = this.validatePlugin(pluginObj, filename, shortname);
    
        if (pluginObj instanceof LessError) {
            return pluginObj;
        }
    
        if (pluginObj) {
            pluginObj.imports = imports;
            pluginObj.filename = filename;
    
            // For < 3.x (or unspecified minVersion) - setOptions() before install()
            if (!pluginObj.minVersion || this.compareVersion('3.0.0', pluginObj.minVersion) < 0) {
                result = this.trySetOptions(pluginObj, filename, shortname, pluginOptions);
    
                if (result) {
                    return result;
                }
            }
    
            // Run on first load
            pluginManager.addPlugin(pluginObj, fileInfo.filename, registry);
            pluginObj.functions = registry.getLocalFunctions();
    
            // Need to call setOptions again because the pluginObj might have functions
            result = this.trySetOptions(pluginObj, filename, shortname, pluginOptions);
            if (result) {
                return result;
            }
    
            // Run every @plugin call
            try {
                if (pluginObj.use) {
                    pluginObj.use.call(this.context, pluginObj);
                }
            }
            catch (e) {
                e.message = e.message || 'Error during @plugin call';
                return new LessError(e, imports, filename);
            }
    
        }
        else {
            return new LessError({ message: 'Not a valid plugin' }, imports, filename);
        }
    
        return pluginObj;
    
    };
    
    AbstractPluginLoader.prototype.trySetOptions = function(plugin, filename, name, options) {
        if (options && !plugin.setOptions) {
            return new LessError({
                message: 'Options have been provided but the plugin ' +
                    name + ' does not support any options.'
            });
        }
        try {
            plugin.setOptions && plugin.setOptions(options);
        }
        catch (e) {
            return new LessError(e);
        }
    };
    
    AbstractPluginLoader.prototype.validatePlugin = function(plugin, filename, name) {
        if (plugin) {
            // support plugins being a function
            // so that the plugin can be more usable programmatically
            if (typeof plugin === 'function') {
                plugin = new plugin();
            }
    
            if (plugin.minVersion) {
                if (this.compareVersion(plugin.minVersion, this.less.version) < 0) {
                    return new LessError({
                        message: 'Plugin ' + name + ' requires version ' +
                            this.versionToString(plugin.minVersion)
                    });
                }
            }
            return plugin;
        }
        return null;
    };
    
    AbstractPluginLoader.prototype.compareVersion = function(aVersion, bVersion) {
        if (typeof aVersion === 'string') {
            aVersion = aVersion.match(/^(\d+)\.?(\d+)?\.?(\d+)?/);
            aVersion.shift();
        }
        for (var i = 0; i < aVersion.length; i++) {
            if (aVersion[i] !== bVersion[i]) {
                return parseInt(aVersion[i]) > parseInt(bVersion[i]) ? -1 : 1;
            }
        }
        return 0;
    };
    AbstractPluginLoader.prototype.versionToString = function(version) {
        var versionString = '';
        for (var i = 0; i < version.length; i++) {
            versionString += (versionString ? '.' : '') + version[i];
        }
        return versionString;
    };
    AbstractPluginLoader.prototype.printUsage = function(plugins) {
        for (var i = 0; i < plugins.length; i++) {
            var plugin = plugins[i];
            if (plugin.printUsage) {
                plugin.printUsage();
            }
        }
    };
    
    module.exports = AbstractPluginLoader;
    
    
    },{"../functions/function-registry":27,"../less-error":38}],20:[function(require,module,exports){
    /**
     * @todo Document why this abstraction exists, and the relationship between
     *       environment, file managers, and plugin manager
     */
    
    var logger = require('../logger');
    var environment = function(externalEnvironment, fileManagers) {
        this.fileManagers = fileManagers || [];
        externalEnvironment = externalEnvironment || {};
    
        var optionalFunctions = ['encodeBase64', 'mimeLookup', 'charsetLookup', 'getSourceMapGenerator'],
            requiredFunctions = [],
            functions = requiredFunctions.concat(optionalFunctions);
    
        for (var i = 0; i < functions.length; i++) {
            var propName = functions[i],
                environmentFunc = externalEnvironment[propName];
            if (environmentFunc) {
                this[propName] = environmentFunc.bind(externalEnvironment);
            } else if (i < requiredFunctions.length) {
                this.warn('missing required function in environment - ' + propName);
            }
        }
    };
    
    environment.prototype.getFileManager = function (filename, currentDirectory, options, environment, isSync) {
    
        if (!filename) {
            logger.warn('getFileManager called with no filename.. Please report this issue. continuing.');
        }
        if (currentDirectory == null) {
            logger.warn('getFileManager called with null directory.. Please report this issue. continuing.');
        }
    
        var fileManagers = this.fileManagers;
        if (options.pluginManager) {
            fileManagers = [].concat(fileManagers).concat(options.pluginManager.getFileManagers());
        }
        for (var i = fileManagers.length - 1; i >= 0 ; i--) {
            var fileManager = fileManagers[i];
            if (fileManager[isSync ? 'supportsSync' : 'supports'](filename, currentDirectory, options, environment)) {
                return fileManager;
            }
        }
        return null;
    };
    
    environment.prototype.addFileManager = function (fileManager) {
        this.fileManagers.push(fileManager);
    };
    
    environment.prototype.clearFileManagers = function () {
        this.fileManagers = [];
    };
    
    module.exports = environment;
    
    },{"../logger":39}],21:[function(require,module,exports){
    
    var functionRegistry = require('./function-registry'),
        Anonymous = require('../tree/anonymous'),
        Keyword = require('../tree/keyword');
    
    functionRegistry.addMultiple({
        boolean: function(condition) {
            return condition ? Keyword.True : Keyword.False;
        },
    
        'if': function(condition, trueValue, falseValue) {
            return condition ? trueValue
                : (falseValue || new Anonymous);
        }
    });
    
    },{"../tree/anonymous":50,"../tree/keyword":70,"./function-registry":27}],22:[function(require,module,exports){
    var Color = require('../tree/color'),
        functionRegistry = require('./function-registry');
    
    // Color Blending
    // ref: http://www.w3.org/TR/compositing-1
    
    function colorBlend(mode, color1, color2) {
        var ab = color1.alpha, cb, // backdrop
            as = color2.alpha, cs, // source
            ar, cr, r = [];        // result
    
        ar = as + ab * (1 - as);
        for (var i = 0; i < 3; i++) {
            cb = color1.rgb[i] / 255;
            cs = color2.rgb[i] / 255;
            cr = mode(cb, cs);
            if (ar) {
                cr = (as * cs + ab * (cb -
                      as * (cb + cs - cr))) / ar;
            }
            r[i] = cr * 255;
        }
    
        return new Color(r, ar);
    }
    
    var colorBlendModeFunctions = {
        multiply: function(cb, cs) {
            return cb * cs;
        },
        screen: function(cb, cs) {
            return cb + cs - cb * cs;
        },
        overlay: function(cb, cs) {
            cb *= 2;
            return (cb <= 1) ?
                colorBlendModeFunctions.multiply(cb, cs) :
                colorBlendModeFunctions.screen(cb - 1, cs);
        },
        softlight: function(cb, cs) {
            var d = 1, e = cb;
            if (cs > 0.5) {
                e = 1;
                d = (cb > 0.25) ? Math.sqrt(cb)
                    : ((16 * cb - 12) * cb + 4) * cb;
            }
            return cb - (1 - 2 * cs) * e * (d - cb);
        },
        hardlight: function(cb, cs) {
            return colorBlendModeFunctions.overlay(cs, cb);
        },
        difference: function(cb, cs) {
            return Math.abs(cb - cs);
        },
        exclusion: function(cb, cs) {
            return cb + cs - 2 * cb * cs;
        },
    
        // non-w3c functions:
        average: function(cb, cs) {
            return (cb + cs) / 2;
        },
        negation: function(cb, cs) {
            return 1 - Math.abs(cb + cs - 1);
        }
    };
    
    for (var f in colorBlendModeFunctions) {
        if (colorBlendModeFunctions.hasOwnProperty(f)) {
            colorBlend[f] = colorBlend.bind(null, colorBlendModeFunctions[f]);
        }
    }
    
    functionRegistry.addMultiple(colorBlend);
    
    },{"../tree/color":55,"./function-registry":27}],23:[function(require,module,exports){
    var Dimension = require('../tree/dimension'),
        Color = require('../tree/color'),
        Quoted = require('../tree/quoted'),
        Anonymous = require('../tree/anonymous'),
        functionRegistry = require('./function-registry'),
        colorFunctions;
    
    function clamp(val) {
        return Math.min(1, Math.max(0, val));
    }
    function hsla(origColor, hsl) {
        var color = colorFunctions.hsla(hsl.h, hsl.s, hsl.l, hsl.a);
        if (color) {
            if (origColor.value && 
                /^(rgb|hsl)/.test(origColor.value)) {
                color.value = origColor.value;
            } else {
                color.value = 'rgb';
            }
            return color;
        }
    }
    function number(n) {
        if (n instanceof Dimension) {
            return parseFloat(n.unit.is('%') ? n.value / 100 : n.value);
        } else if (typeof n === 'number') {
            return n;
        } else {
            throw {
                type: 'Argument',
                message: 'color functions take numbers as parameters'
            };
        }
    }
    function scaled(n, size) {
        if (n instanceof Dimension && n.unit.is('%')) {
            return parseFloat(n.value * size / 100);
        } else {
            return number(n);
        }
    }
    colorFunctions = {
        rgb: function (r, g, b) {
            var color = colorFunctions.rgba(r, g, b, 1.0);
            if (color) {
                color.value = 'rgb';
                return color;
            }
        },
        rgba: function (r, g, b, a) {
            try {
                if (r instanceof Color) {
                    if (g) {
                        a = number(g);
                    } else {
                        a = r.alpha;
                    }
                    return new Color(r.rgb, a, 'rgba');
                }
                var rgb = [r, g, b].map(function (c) { return scaled(c, 255); });
                a = number(a);
                return new Color(rgb, a, 'rgba');
            }
            catch (e) {}
        },
        hsl: function (h, s, l) {
            var color = colorFunctions.hsla(h, s, l, 1.0);
            if (color) {
                color.value = 'hsl';
                return color;
            }
        },
        hsla: function (h, s, l, a) {
            try {
                if (h instanceof Color) {
                    if (s) {
                        a = number(s);
                    } else {
                        a = h.alpha;
                    }
                    return new Color(h.rgb, a, 'hsla');
                }
    
                var m1, m2;
    
                function hue(h) {
                    h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
                    if (h * 6 < 1) {
                        return m1 + (m2 - m1) * h * 6;
                    }
                    else if (h * 2 < 1) {
                        return m2;
                    }
                    else if (h * 3 < 2) {
                        return m1 + (m2 - m1) * (2 / 3 - h) * 6;
                    }
                    else {
                        return m1;
                    }
                }
    
                h = (number(h) % 360) / 360;
                s = clamp(number(s)); l = clamp(number(l)); a = clamp(number(a));
    
                m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
                m1 = l * 2 - m2;
    
                var rgb = [
                    hue(h + 1 / 3) * 255,
                    hue(h)       * 255,
                    hue(h - 1 / 3) * 255
                ];
                a = number(a);
                return new Color(rgb, a, 'hsla');
            }
            catch (e) {}
        },
    
        hsv: function(h, s, v) {
            return colorFunctions.hsva(h, s, v, 1.0);
        },
    
        hsva: function(h, s, v, a) {
            h = ((number(h) % 360) / 360) * 360;
            s = number(s); v = number(v); a = number(a);
    
            var i, f;
            i = Math.floor((h / 60) % 6);
            f = (h / 60) - i;
    
            var vs = [v,
                v * (1 - s),
                v * (1 - f * s),
                v * (1 - (1 - f) * s)];
            var perm = [[0, 3, 1],
                [2, 0, 1],
                [1, 0, 3],
                [1, 2, 0],
                [3, 1, 0],
                [0, 1, 2]];
    
            return colorFunctions.rgba(vs[perm[i][0]] * 255,
                vs[perm[i][1]] * 255,
                vs[perm[i][2]] * 255,
                a);
        },
    
        hue: function (color) {
            return new Dimension(color.toHSL().h);
        },
        saturation: function (color) {
            return new Dimension(color.toHSL().s * 100, '%');
        },
        lightness: function (color) {
            return new Dimension(color.toHSL().l * 100, '%');
        },
        hsvhue: function(color) {
            return new Dimension(color.toHSV().h);
        },
        hsvsaturation: function (color) {
            return new Dimension(color.toHSV().s * 100, '%');
        },
        hsvvalue: function (color) {
            return new Dimension(color.toHSV().v * 100, '%');
        },
        red: function (color) {
            return new Dimension(color.rgb[0]);
        },
        green: function (color) {
            return new Dimension(color.rgb[1]);
        },
        blue: function (color) {
            return new Dimension(color.rgb[2]);
        },
        alpha: function (color) {
            return new Dimension(color.toHSL().a);
        },
        luma: function (color) {
            return new Dimension(color.luma() * color.alpha * 100, '%');
        },
        luminance: function (color) {
            var luminance =
                (0.2126 * color.rgb[0] / 255) +
                    (0.7152 * color.rgb[1] / 255) +
                    (0.0722 * color.rgb[2] / 255);
    
            return new Dimension(luminance * color.alpha * 100, '%');
        },
        saturate: function (color, amount, method) {
            // filter: saturate(3.2);
            // should be kept as is, so check for color
            if (!color.rgb) {
                return null;
            }
            var hsl = color.toHSL();
    
            if (typeof method !== 'undefined' && method.value === 'relative') {
                hsl.s +=  hsl.s * amount.value / 100;
            }
            else {
                hsl.s += amount.value / 100;
            }
            hsl.s = clamp(hsl.s);
            return hsla(color, hsl);
        },
        desaturate: function (color, amount, method) {
            var hsl = color.toHSL();
    
            if (typeof method !== 'undefined' && method.value === 'relative') {
                hsl.s -=  hsl.s * amount.value / 100;
            }
            else {
                hsl.s -= amount.value / 100;
            }
            hsl.s = clamp(hsl.s);
            return hsla(color, hsl);
        },
        lighten: function (color, amount, method) {
            var hsl = color.toHSL();
    
            if (typeof method !== 'undefined' && method.value === 'relative') {
                hsl.l +=  hsl.l * amount.value / 100;
            }
            else {
                hsl.l += amount.value / 100;
            }
            hsl.l = clamp(hsl.l);
            return hsla(color, hsl);
        },
        darken: function (color, amount, method) {
            var hsl = color.toHSL();
    
            if (typeof method !== 'undefined' && method.value === 'relative') {
                hsl.l -=  hsl.l * amount.value / 100;
            }
            else {
                hsl.l -= amount.value / 100;
            }
            hsl.l = clamp(hsl.l);
            return hsla(color, hsl);
        },
        fadein: function (color, amount, method) {
            var hsl = color.toHSL();
    
            if (typeof method !== 'undefined' && method.value === 'relative') {
                hsl.a +=  hsl.a * amount.value / 100;
            }
            else {
                hsl.a += amount.value / 100;
            }
            hsl.a = clamp(hsl.a);
            return hsla(color, hsl);
        },
        fadeout: function (color, amount, method) {
            var hsl = color.toHSL();
    
            if (typeof method !== 'undefined' && method.value === 'relative') {
                hsl.a -=  hsl.a * amount.value / 100;
            }
            else {
                hsl.a -= amount.value / 100;
            }
            hsl.a = clamp(hsl.a);
            return hsla(color, hsl);
        },
        fade: function (color, amount) {
            var hsl = color.toHSL();
    
            hsl.a = amount.value / 100;
            hsl.a = clamp(hsl.a);
            return hsla(color, hsl);
        },
        spin: function (color, amount) {
            var hsl = color.toHSL();
            var hue = (hsl.h + amount.value) % 360;
    
            hsl.h = hue < 0 ? 360 + hue : hue;
    
            return hsla(color, hsl);
        },
        //
        // Copyright (c) 2006-2009 Hampton Catlin, Natalie Weizenbaum, and Chris Eppstein
        // http://sass-lang.com
        //
        mix: function (color1, color2, weight) {
            if (!color1.toHSL || !color2.toHSL) {
                console.log(color2.type);
                console.dir(color2);
            }
            if (!weight) {
                weight = new Dimension(50);
            }
            var p = weight.value / 100.0;
            var w = p * 2 - 1;
            var a = color1.toHSL().a - color2.toHSL().a;
    
            var w1 = (((w * a == -1) ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
            var w2 = 1 - w1;
    
            var rgb = [color1.rgb[0] * w1 + color2.rgb[0] * w2,
                color1.rgb[1] * w1 + color2.rgb[1] * w2,
                color1.rgb[2] * w1 + color2.rgb[2] * w2];
    
            var alpha = color1.alpha * p + color2.alpha * (1 - p);
    
            return new Color(rgb, alpha);
        },
        greyscale: function (color) {
            return colorFunctions.desaturate(color, new Dimension(100));
        },
        contrast: function (color, dark, light, threshold) {
            // filter: contrast(3.2);
            // should be kept as is, so check for color
            if (!color.rgb) {
                return null;
            }
            if (typeof light === 'undefined') {
                light = colorFunctions.rgba(255, 255, 255, 1.0);
            }
            if (typeof dark === 'undefined') {
                dark = colorFunctions.rgba(0, 0, 0, 1.0);
            }
            // Figure out which is actually light and dark:
            if (dark.luma() > light.luma()) {
                var t = light;
                light = dark;
                dark = t;
            }
            if (typeof threshold === 'undefined') {
                threshold = 0.43;
            } else {
                threshold = number(threshold);
            }
            if (color.luma() < threshold) {
                return light;
            } else {
                return dark;
            }
        },
        // Changes made in 2.7.0 - Reverted in 3.0.0
        // contrast: function (color, color1, color2, threshold) {
        //     // Return which of `color1` and `color2` has the greatest contrast with `color`
        //     // according to the standard WCAG contrast ratio calculation.
        //     // http://www.w3.org/TR/WCAG20/#contrast-ratiodef
        //     // The threshold param is no longer used, in line with SASS.
        //     // filter: contrast(3.2);
        //     // should be kept as is, so check for color
        //     if (!color.rgb) {
        //         return null;
        //     }
        //     if (typeof color1 === 'undefined') {
        //         color1 = colorFunctions.rgba(0, 0, 0, 1.0);
        //     }
        //     if (typeof color2 === 'undefined') {
        //         color2 = colorFunctions.rgba(255, 255, 255, 1.0);
        //     }
        //     var contrast1, contrast2;
        //     var luma = color.luma();
        //     var luma1 = color1.luma();
        //     var luma2 = color2.luma();
        //     // Calculate contrast ratios for each color
        //     if (luma > luma1) {
        //         contrast1 = (luma + 0.05) / (luma1 + 0.05);
        //     } else {
        //         contrast1 = (luma1 + 0.05) / (luma + 0.05);
        //     }
        //     if (luma > luma2) {
        //         contrast2 = (luma + 0.05) / (luma2 + 0.05);
        //     } else {
        //         contrast2 = (luma2 + 0.05) / (luma + 0.05);
        //     }
        //     if (contrast1 > contrast2) {
        //         return color1;
        //     } else {
        //         return color2;
        //     }
        // },
        argb: function (color) {
            return new Anonymous(color.toARGB());
        },
        color: function(c) {
            if ((c instanceof Quoted) &&
                (/^#([A-Fa-f0-9]{8}|[A-Fa-f0-9]{6}|[A-Fa-f0-9]{3,4})$/i.test(c.value))) {
                var val = c.value.slice(1);
                return new Color(val, undefined, '#' + val);
            }
            if ((c instanceof Color) || (c = Color.fromKeyword(c.value))) {
                c.value = undefined;
                return c;
            }
            throw {
                type:    'Argument',
                message: 'argument must be a color keyword or 3|4|6|8 digit hex e.g. #FFF'
            };
        },
        tint: function(color, amount) {
            return colorFunctions.mix(colorFunctions.rgb(255, 255, 255), color, amount);
        },
        shade: function(color, amount) {
            return colorFunctions.mix(colorFunctions.rgb(0, 0, 0), color, amount);
        }
    };
    functionRegistry.addMultiple(colorFunctions);
    
    },{"../tree/anonymous":50,"../tree/color":55,"../tree/dimension":62,"../tree/quoted":80,"./function-registry":27}],24:[function(require,module,exports){
    module.exports = function(environment) {
        var Quoted = require('../tree/quoted'),
            URL = require('../tree/url'),
            utils = require('../utils'),
            functionRegistry = require('./function-registry'),
            fallback = function(functionThis, node) {
                return new URL(node, functionThis.index, functionThis.currentFileInfo).eval(functionThis.context);
            },
            logger = require('../logger');
    
        functionRegistry.add('data-uri', function(mimetypeNode, filePathNode) {
    
            if (!filePathNode) {
                filePathNode = mimetypeNode;
                mimetypeNode = null;
            }
    
            var mimetype = mimetypeNode && mimetypeNode.value;
            var filePath = filePathNode.value;
            var currentFileInfo = this.currentFileInfo;
            var currentDirectory = currentFileInfo.rewriteUrls ?
                currentFileInfo.currentDirectory : currentFileInfo.entryPath;
    
            var fragmentStart = filePath.indexOf('#');
            var fragment = '';
            if (fragmentStart !== -1) {
                fragment = filePath.slice(fragmentStart);
                filePath = filePath.slice(0, fragmentStart);
            }
            var context = utils.clone(this.context);
            context.rawBuffer = true;
    
            var fileManager = environment.getFileManager(filePath, currentDirectory, context, environment, true);
    
            if (!fileManager) {
                return fallback(this, filePathNode);
            }
    
            var useBase64 = false;
    
            // detect the mimetype if not given
            if (!mimetypeNode) {
    
                mimetype = environment.mimeLookup(filePath);
    
                if (mimetype === 'image/svg+xml') {
                    useBase64 = false;
                } else {
                    // use base 64 unless it's an ASCII or UTF-8 format
                    var charset = environment.charsetLookup(mimetype);
                    useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0;
                }
                if (useBase64) { mimetype += ';base64'; }
            }
            else {
                useBase64 = /;base64$/.test(mimetype);
            }
    
            var fileSync = fileManager.loadFileSync(filePath, currentDirectory, context, environment);
            if (!fileSync.contents) {
                logger.warn('Skipped data-uri embedding of ' + filePath + ' because file not found');
                return fallback(this, filePathNode || mimetypeNode);
            }
            var buf = fileSync.contents;
            if (useBase64 && !environment.encodeBase64) {
                return fallback(this, filePathNode);
            }
    
            buf = useBase64 ? environment.encodeBase64(buf) : encodeURIComponent(buf);
    
            var uri = 'data:' + mimetype + ',' + buf + fragment;
    
            // IE8 cannot handle a data-uri larger than 32,768 characters. If this is exceeded
            // and the --ieCompat flag is enabled, return a normal url() instead.
            var DATA_URI_MAX = 32768;
            if (uri.length >= DATA_URI_MAX) {
    
                if (this.context.ieCompat !== false) {
                    logger.warn('Skipped data-uri embedding of ' + filePath + ' because its size (' + uri.length +
                        ' characters) exceeds IE8-safe ' + DATA_URI_MAX + ' characters!');
    
                    return fallback(this, filePathNode || mimetypeNode);
                }
            }
    
            return new URL(new Quoted('"' + uri + '"', uri, false, this.index, this.currentFileInfo), this.index, this.currentFileInfo);
        });
    };
    
    },{"../logger":39,"../tree/quoted":80,"../tree/url":85,"../utils":89,"./function-registry":27}],25:[function(require,module,exports){
    var Keyword = require('../tree/keyword'),
        functionRegistry = require('./function-registry');
    
    var defaultFunc = {
        eval: function () {
            var v = this.value_, e = this.error_;
            if (e) {
                throw e;
            }
            if (v != null) {
                return v ? Keyword.True : Keyword.False;
            }
        },
        value: function (v) {
            this.value_ = v;
        },
        error: function (e) {
            this.error_ = e;
        },
        reset: function () {
            this.value_ = this.error_ = null;
        }
    };
    
    functionRegistry.add('default', defaultFunc.eval.bind(defaultFunc));
    
    module.exports = defaultFunc;
    
    },{"../tree/keyword":70,"./function-registry":27}],26:[function(require,module,exports){
    var Expression = require('../tree/expression');
    
    var functionCaller = function(name, context, index, currentFileInfo) {
        this.name = name.toLowerCase();
        this.index = index;
        this.context = context;
        this.currentFileInfo = currentFileInfo;
    
        this.func = context.frames[0].functionRegistry.get(this.name);
    };
    functionCaller.prototype.isValid = function() {
        return Boolean(this.func);
    };
    
    functionCaller.prototype.call = function(args) {
        // This code is terrible and should be replaced as per this issue...
        // https://github.com/less/less.js/issues/2477
        if (Array.isArray(args)) {
            args = args.filter(function (item) {
                if (item.type === 'Comment') {
                    return false;
                }
                return true;
            })
            .map(function(item) {
                if (item.type === 'Expression') {
                    var subNodes = item.value.filter(function (item) {
                        if (item.type === 'Comment') {
                            return false;
                        }
                        return true;
                    });
                    if (subNodes.length === 1) {
                        return subNodes[0];
                    } else {
                        return new Expression(subNodes);
                    }
                }
                return item;
            });
        }
    
        return this.func.apply(this, args);
    };
    
    module.exports = functionCaller;
    
    },{"../tree/expression":64}],27:[function(require,module,exports){
    function makeRegistry( base ) {
        return {
            _data: {},
            add: function(name, func) {
                // precautionary case conversion, as later querying of
                // the registry by function-caller uses lower case as well.
                name = name.toLowerCase();
    
                if (this._data.hasOwnProperty(name)) {
                    // TODO warn
                }
                this._data[name] = func;
            },
            addMultiple: function(functions) {
                Object.keys(functions).forEach(
                    function(name) {
                        this.add(name, functions[name]);
                    }.bind(this));
            },
            get: function(name) {
                return this._data[name] || ( base && base.get( name ));
            },
            getLocalFunctions: function() {
                return this._data;
            },
            inherit: function() {
                return makeRegistry( this );
            },
            create: function(base) {
                return makeRegistry(base);
            }
        };
    }
    
    module.exports = makeRegistry( null );
    },{}],28:[function(require,module,exports){
    module.exports = function(environment) {
        var functions = {
            functionRegistry: require('./function-registry'),
            functionCaller: require('./function-caller')
        };
    
        // register functions
        require('./boolean');
        require('./default');
        require('./color');
        require('./color-blending');
        require('./data-uri')(environment);
        require('./list');
        require('./math');
        require('./number');
        require('./string');
        require('./svg')(environment);
        require('./types');
    
        return functions;
    };
    
    },{"./boolean":21,"./color":23,"./color-blending":22,"./data-uri":24,"./default":25,"./function-caller":26,"./function-registry":27,"./list":29,"./math":31,"./number":32,"./string":33,"./svg":34,"./types":35}],29:[function(require,module,exports){
    var Comment = require('../tree/comment'),
        Dimension = require('../tree/dimension'),
        Declaration = require('../tree/declaration'),
        Expression = require('../tree/expression'),
        Ruleset = require('../tree/ruleset'),
        Selector = require('../tree/selector'),
        Element = require('../tree/element'),
        functionRegistry = require('./function-registry');
    
    var getItemsFromNode = function(node) {
        // handle non-array values as an array of length 1
        // return 'undefined' if index is invalid
        var items = Array.isArray(node.value) ?
            node.value : Array(node);
    
        return items;
    };
    
    functionRegistry.addMultiple({
        _SELF: function(n) {
            return n;
        },
        extract: function(values, index) {
            index = index.value - 1; // (1-based index)
    
            return getItemsFromNode(values)[index];
        },
        length: function(values) {
            return new Dimension(getItemsFromNode(values).length);
        },
        /**
         * Creates a Less list of incremental values.
         * Modeled after Lodash's range function, also exists natively in PHP
         * 
         * @param {Dimension} [start=1]
         * @param {Dimension} end  - e.g. 10 or 10px - unit is added to output
         * @param {Dimension} [step=1] 
         */
        range: function(start, end, step) {
            var from, to, stepValue = 1, list = [];
            if (end) {
                to = end;
                from = start.value;
                if (step) {
                    stepValue = step.value;
                }
            }
            else {
                from = 1;
                to = start;
            }
    
            for (var i = from; i <= to.value; i += stepValue) {
                list.push(new Dimension(i, to.unit));
            }
    
            return new Expression(list);
        },
        each: function(list, rs) {
            var rules = [], newRules, iterator;
    
            if (list.value) {
                if (Array.isArray(list.value)) {
                    iterator = list.value;
                } else {
                    iterator = [list.value];
                }
            } else if (list.ruleset) {
                iterator = list.ruleset.rules;
            } else if (list.rules) {
                iterator = list.rules;
            } else if (Array.isArray(list)) {
                iterator = list;
            } else {
                iterator = [list];
            }
    
            var valueName = '@value',
                keyName = '@key',
                indexName = '@index';
    
            if (rs.params) {
                valueName = rs.params[0] && rs.params[0].name;
                keyName = rs.params[1] && rs.params[1].name;
                indexName = rs.params[2] && rs.params[2].name;
                rs = rs.rules;
            } else {
                rs = rs.ruleset;
            }
    
            for (var i = 0; i < iterator.length; i++) {
                var key, value, item = iterator[i];
                if (item instanceof Declaration) {
                    key = typeof item.name === 'string' ? item.name : item.name[0].value;
                    value = item.value;
                } else {
                    key = new Dimension(i + 1);
                    value = item;
                }
                
                if (item instanceof Comment) {
                    continue;
                }
    
                newRules = rs.rules.slice(0);
                if (valueName) {
                    newRules.push(new Declaration(valueName,
                        value,
                        false, false, this.index, this.currentFileInfo));
                }
                if (indexName) {
                    newRules.push(new Declaration(indexName,
                        new Dimension(i + 1),
                        false, false, this.index, this.currentFileInfo));
                }
                if (keyName) {
                    newRules.push(new Declaration(keyName,
                        key,
                        false, false, this.index, this.currentFileInfo));
                }
            
                rules.push(new Ruleset([ new(Selector)([ new Element("", '&') ]) ],
                    newRules,
                    rs.strictImports,
                    rs.visibilityInfo()
                ));
            }
    
            return new Ruleset([ new(Selector)([ new Element("", '&') ]) ],
                    rules,
                    rs.strictImports,
                    rs.visibilityInfo()
                ).eval(this.context);
    
        }
    });
    
    },{"../tree/comment":57,"../tree/declaration":60,"../tree/dimension":62,"../tree/element":63,"../tree/expression":64,"../tree/ruleset":81,"../tree/selector":82,"./function-registry":27}],30:[function(require,module,exports){
    var Dimension = require('../tree/dimension');
    
    var MathHelper = function() {
    };
    MathHelper._math = function (fn, unit, n) {
        if (!(n instanceof Dimension)) {
            throw { type: 'Argument', message: 'argument must be a number' };
        }
        if (unit == null) {
            unit = n.unit;
        } else {
            n = n.unify();
        }
        return new Dimension(fn(parseFloat(n.value)), unit);
    };
    module.exports = MathHelper;
    },{"../tree/dimension":62}],31:[function(require,module,exports){
    var functionRegistry = require('./function-registry'),
        mathHelper = require('./math-helper.js');
    
    var mathFunctions = {
        // name,  unit
        ceil:  null,
        floor: null,
        sqrt:  null,
        abs:   null,
        tan:   '',
        sin:   '',
        cos:   '',
        atan:  'rad',
        asin:  'rad',
        acos:  'rad'
    };
    
    for (var f in mathFunctions) {
        if (mathFunctions.hasOwnProperty(f)) {
            mathFunctions[f] = mathHelper._math.bind(null, Math[f], mathFunctions[f]);
        }
    }
    
    mathFunctions.round = function (n, f) {
        var fraction = typeof f === 'undefined' ? 0 : f.value;
        return mathHelper._math(function(num) { return num.toFixed(fraction); }, null, n);
    };
    
    functionRegistry.addMultiple(mathFunctions);
    
    },{"./function-registry":27,"./math-helper.js":30}],32:[function(require,module,exports){
    var Dimension = require('../tree/dimension'),
        Anonymous = require('../tree/anonymous'),
        functionRegistry = require('./function-registry'),
        mathHelper = require('./math-helper.js');
    
    var minMax = function (isMin, args) {
        args = Array.prototype.slice.call(args);
        switch (args.length) {
            case 0: throw { type: 'Argument', message: 'one or more arguments required' };
        }
        var i, j, current, currentUnified, referenceUnified, unit, unitStatic, unitClone,
            order  = [], // elems only contains original argument values.
            values = {}; // key is the unit.toString() for unified Dimension values,
        // value is the index into the order array.
        for (i = 0; i < args.length; i++) {
            current = args[i];
            if (!(current instanceof Dimension)) {
                if (Array.isArray(args[i].value)) {
                    Array.prototype.push.apply(args, Array.prototype.slice.call(args[i].value));
                }
                continue;
            }
            currentUnified = current.unit.toString() === '' && unitClone !== undefined ? new Dimension(current.value, unitClone).unify() : current.unify();
            unit = currentUnified.unit.toString() === '' && unitStatic !== undefined ? unitStatic : currentUnified.unit.toString();
            unitStatic = unit !== '' && unitStatic === undefined || unit !== '' && order[0].unify().unit.toString() === '' ? unit : unitStatic;
            unitClone = unit !== '' && unitClone === undefined ? current.unit.toString() : unitClone;
            j = values[''] !== undefined && unit !== '' && unit === unitStatic ? values[''] : values[unit];
            if (j === undefined) {
                if (unitStatic !== undefined && unit !== unitStatic) {
                    throw { type: 'Argument', message: 'incompatible types' };
                }
                values[unit] = order.length;
                order.push(current);
                continue;
            }
            referenceUnified = order[j].unit.toString() === '' && unitClone !== undefined ? new Dimension(order[j].value, unitClone).unify() : order[j].unify();
            if ( isMin && currentUnified.value < referenceUnified.value ||
                !isMin && currentUnified.value > referenceUnified.value) {
                order[j] = current;
            }
        }
        if (order.length == 1) {
            return order[0];
        }
        args = order.map(function (a) { return a.toCSS(this.context); }).join(this.context.compress ? ',' : ', ');
        return new Anonymous((isMin ? 'min' : 'max') + '(' + args + ')');
    };
    functionRegistry.addMultiple({
        min: function () {
            return minMax(true, arguments);
        },
        max: function () {
            return minMax(false, arguments);
        },
        convert: function (val, unit) {
            return val.convertTo(unit.value);
        },
        pi: function () {
            return new Dimension(Math.PI);
        },
        mod: function(a, b) {
            return new Dimension(a.value % b.value, a.unit);
        },
        pow: function(x, y) {
            if (typeof x === 'number' && typeof y === 'number') {
                x = new Dimension(x);
                y = new Dimension(y);
            } else if (!(x instanceof Dimension) || !(y instanceof Dimension)) {
                throw { type: 'Argument', message: 'arguments must be numbers' };
            }
    
            return new Dimension(Math.pow(x.value, y.value), x.unit);
        },
        percentage: function (n) {
            var result = mathHelper._math(function(num) {
                return num * 100;
            }, '%', n);
    
            return result;
        }
    });
    
    },{"../tree/anonymous":50,"../tree/dimension":62,"./function-registry":27,"./math-helper.js":30}],33:[function(require,module,exports){
    var Quoted = require('../tree/quoted'),
        Anonymous = require('../tree/anonymous'),
        JavaScript = require('../tree/javascript'),
        functionRegistry = require('./function-registry');
    
    functionRegistry.addMultiple({
        e: function (str) {
            return new Anonymous(str instanceof JavaScript ? str.evaluated : str.value);
        },
        escape: function (str) {
            return new Anonymous(
                encodeURI(str.value).replace(/=/g, '%3D').replace(/:/g, '%3A').replace(/#/g, '%23').replace(/;/g, '%3B')
                    .replace(/\(/g, '%28').replace(/\)/g, '%29'));
        },
        replace: function (string, pattern, replacement, flags) {
            var result = string.value;
            replacement = (replacement.type === 'Quoted') ?
                replacement.value : replacement.toCSS();
            result = result.replace(new RegExp(pattern.value, flags ? flags.value : ''), replacement);
            return new Quoted(string.quote || '', result, string.escaped);
        },
        '%': function (string /* arg, arg, ... */) {
            var args = Array.prototype.slice.call(arguments, 1),
                result = string.value;
    
            for (var i = 0; i < args.length; i++) {
                /* jshint loopfunc:true */
                result = result.replace(/%[sda]/i, function(token) {
                    var value = ((args[i].type === 'Quoted') &&
                        token.match(/s/i)) ? args[i].value : args[i].toCSS();
                    return token.match(/[A-Z]$/) ? encodeURIComponent(value) : value;
                });
            }
            result = result.replace(/%%/g, '%');
            return new Quoted(string.quote || '', result, string.escaped);
        }
    });
    
    },{"../tree/anonymous":50,"../tree/javascript":68,"../tree/quoted":80,"./function-registry":27}],34:[function(require,module,exports){
    module.exports = function(environment) {
        var Dimension = require('../tree/dimension'),
            Color = require('../tree/color'),
            Expression = require('../tree/expression'),
            Quoted = require('../tree/quoted'),
            URL = require('../tree/url'),
            functionRegistry = require('./function-registry');
    
        functionRegistry.add('svg-gradient', function(direction) {
    
            var stops,
                gradientDirectionSvg,
                gradientType = 'linear',
                rectangleDimension = 'x="0" y="0" width="1" height="1"',
                renderEnv = {compress: false},
                returner,
                directionValue = direction.toCSS(renderEnv),
                i, color, position, positionValue, alpha;
    
            function throwArgumentDescriptor() {
                throw { type: 'Argument',
                    message: 'svg-gradient expects direction, start_color [start_position], [color position,]...,' +
                                ' end_color [end_position] or direction, color list' };
            }
    
            if (arguments.length == 2) {
                if (arguments[1].value.length < 2) {
                    throwArgumentDescriptor();
                }
                stops = arguments[1].value;
            } else if (arguments.length < 3) {
                throwArgumentDescriptor();
            } else {
                stops = Array.prototype.slice.call(arguments, 1);
            }
    
            switch (directionValue) {
                case 'to bottom':
                    gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
                    break;
                case 'to right':
                    gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
                    break;
                case 'to bottom right':
                    gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
                    break;
                case 'to top right':
                    gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
                    break;
                case 'ellipse':
                case 'ellipse at center':
                    gradientType = 'radial';
                    gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
                    rectangleDimension = 'x="-50" y="-50" width="101" height="101"';
                    break;
                default:
                    throw { type: 'Argument', message: 'svg-gradient direction must be \'to bottom\', \'to right\',' +
                        ' \'to bottom right\', \'to top right\' or \'ellipse at center\'' };
            }
            returner = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1 1">' +
                '<' + gradientType + 'Gradient id="g" ' + gradientDirectionSvg + '>';
    
            for (i = 0; i < stops.length; i += 1) {
                if (stops[i] instanceof Expression) {
                    color = stops[i].value[0];
                    position = stops[i].value[1];
                } else {
                    color = stops[i];
                    position = undefined;
                }
    
                if (!(color instanceof Color) || (!((i === 0 || i + 1 === stops.length) && position === undefined) && !(position instanceof Dimension))) {
                    throwArgumentDescriptor();
                }
                positionValue = position ? position.toCSS(renderEnv) : i === 0 ? '0%' : '100%';
                alpha = color.alpha;
                returner += '<stop offset="' + positionValue + '" stop-color="' + color.toRGB() + '"' + (alpha < 1 ? ' stop-opacity="' + alpha + '"' : '') + '/>';
            }
            returner += '</' + gradientType + 'Gradient>' +
                '<rect ' + rectangleDimension + ' fill="url(#g)" /></svg>';
    
            returner = encodeURIComponent(returner);
    
            returner = 'data:image/svg+xml,' + returner;
            return new URL(new Quoted('\'' + returner + '\'', returner, false, this.index, this.currentFileInfo), this.index, this.currentFileInfo);
        });
    };
    
    },{"../tree/color":55,"../tree/dimension":62,"../tree/expression":64,"../tree/quoted":80,"../tree/url":85,"./function-registry":27}],35:[function(require,module,exports){
    var Keyword = require('../tree/keyword'),
        DetachedRuleset = require('../tree/detached-ruleset'),
        Dimension = require('../tree/dimension'),
        Color = require('../tree/color'),
        Quoted = require('../tree/quoted'),
        Anonymous = require('../tree/anonymous'),
        URL = require('../tree/url'),
        Operation = require('../tree/operation'),
        functionRegistry = require('./function-registry');
    
    var isa = function (n, Type) {
            return (n instanceof Type) ? Keyword.True : Keyword.False;
        },
        isunit = function (n, unit) {
            if (unit === undefined) {
                throw { type: 'Argument', message: 'missing the required second argument to isunit.' };
            }
            unit = typeof unit.value === 'string' ? unit.value : unit;
            if (typeof unit !== 'string') {
                throw { type: 'Argument', message: 'Second argument to isunit should be a unit or a string.' };
            }
            return (n instanceof Dimension) && n.unit.is(unit) ? Keyword.True : Keyword.False;
        };
    
    functionRegistry.addMultiple({
        isruleset: function (n) {
            return isa(n, DetachedRuleset);
        },
        iscolor: function (n) {
            return isa(n, Color);
        },
        isnumber: function (n) {
            return isa(n, Dimension);
        },
        isstring: function (n) {
            return isa(n, Quoted);
        },
        iskeyword: function (n) {
            return isa(n, Keyword);
        },
        isurl: function (n) {
            return isa(n, URL);
        },
        ispixel: function (n) {
            return isunit(n, 'px');
        },
        ispercentage: function (n) {
            return isunit(n, '%');
        },
        isem: function (n) {
            return isunit(n, 'em');
        },
        isunit: isunit,
        unit: function (val, unit) {
            if (!(val instanceof Dimension)) {
                throw { type: 'Argument',
                    message: 'the first argument to unit must be a number' +
                        (val instanceof Operation ? '. Have you forgotten parenthesis?' : '') };
            }
            if (unit) {
                if (unit instanceof Keyword) {
                    unit = unit.value;
                } else {
                    unit = unit.toCSS();
                }
            } else {
                unit = '';
            }
            return new Dimension(val.value, unit);
        },
        'get-unit': function (n) {
            return new Anonymous(n.unit);
        }
    });
    
    },{"../tree/anonymous":50,"../tree/color":55,"../tree/detached-ruleset":61,"../tree/dimension":62,"../tree/keyword":70,"../tree/operation":77,"../tree/quoted":80,"../tree/url":85,"./function-registry":27}],36:[function(require,module,exports){
    var contexts = require('./contexts'),
        Parser = require('./parser/parser'),
        LessError = require('./less-error'),
        utils = require('./utils'),
        PromiseConstructor = typeof Promise === 'undefined' ? require('promise') : Promise,
        logger = require('./logger');
    
    module.exports = function(environment) {
    
        // FileInfo = {
        //  'rewriteUrls' - option - whether to adjust URL's to be relative
        //  'filename' - full resolved filename of current file
        //  'rootpath' - path to append to normal URLs for this node
        //  'currentDirectory' - path to the current file, absolute
        //  'rootFilename' - filename of the base file
        //  'entryPath' - absolute path to the entry file
        //  'reference' - whether the file should not be output and only output parts that are referenced
    
        var ImportManager = function(less, context, rootFileInfo) {
            this.less = less;
            this.rootFilename = rootFileInfo.filename;
            this.paths = context.paths || [];  // Search paths, when importing
            this.contents = {};             // map - filename to contents of all the files
            this.contentsIgnoredChars = {}; // map - filename to lines at the beginning of each file to ignore
            this.mime = context.mime;
            this.error = null;
            this.context = context;
            // Deprecated? Unused outside of here, could be useful.
            this.queue = [];        // Files which haven't been imported yet
            this.files = {};        // Holds the imported parse trees.
        };
    
        /**
         * Add an import to be imported
         * @param path - the raw path
         * @param tryAppendExtension - whether to try appending a file extension (.less or .js if the path has no extension)
         * @param currentFileInfo - the current file info (used for instance to work out relative paths)
         * @param importOptions - import options
         * @param callback - callback for when it is imported
         */
        ImportManager.prototype.push = function (path, tryAppendExtension, currentFileInfo, importOptions, callback) {
            var importManager = this,
                pluginLoader = this.context.pluginManager.Loader;
    
            this.queue.push(path);
    
            var fileParsedFunc = function (e, root, fullPath) {
                importManager.queue.splice(importManager.queue.indexOf(path), 1); // Remove the path from the queue
    
                var importedEqualsRoot = fullPath === importManager.rootFilename;
                if (importOptions.optional && e) {
                    callback(null, {rules:[]}, false, null);
                    logger.info('The file ' + fullPath + ' was skipped because it was not found and the import was marked optional.');
                }
                else {
                    // Inline imports aren't cached here.
                    // If we start to cache them, please make sure they won't conflict with non-inline imports of the
                    // same name as they used to do before this comment and the condition below have been added.
                    if (!importManager.files[fullPath] && !importOptions.inline) {
                        importManager.files[fullPath] = { root: root, options: importOptions };
                    }
                    if (e && !importManager.error) { importManager.error = e; }
                    callback(e, root, importedEqualsRoot, fullPath);
                }
            };
    
            var newFileInfo = {
                rewriteUrls: this.context.rewriteUrls,
                entryPath: currentFileInfo.entryPath,
                rootpath: currentFileInfo.rootpath,
                rootFilename: currentFileInfo.rootFilename
            };
    
            var fileManager = environment.getFileManager(path, currentFileInfo.currentDirectory, this.context, environment);
    
            if (!fileManager) {
                fileParsedFunc({ message: 'Could not find a file-manager for ' + path });
                return;
            }
    
            var loadFileCallback = function(loadedFile) {
                var plugin,
                    resolvedFilename = loadedFile.filename,
                    contents = loadedFile.contents.replace(/^\uFEFF/, '');
    
                // Pass on an updated rootpath if path of imported file is relative and file
                // is in a (sub|sup) directory
                //
                // Examples:
                // - If path of imported file is 'module/nav/nav.less' and rootpath is 'less/',
                //   then rootpath should become 'less/module/nav/'
                // - If path of imported file is '../mixins.less' and rootpath is 'less/',
                //   then rootpath should become 'less/../'
                newFileInfo.currentDirectory = fileManager.getPath(resolvedFilename);
                if (newFileInfo.rewriteUrls) {
                    newFileInfo.rootpath = fileManager.join(
                        (importManager.context.rootpath || ''),
                        fileManager.pathDiff(newFileInfo.currentDirectory, newFileInfo.entryPath));
    
                    if (!fileManager.isPathAbsolute(newFileInfo.rootpath) && fileManager.alwaysMakePathsAbsolute()) {
                        newFileInfo.rootpath = fileManager.join(newFileInfo.entryPath, newFileInfo.rootpath);
                    }
                }
                newFileInfo.filename = resolvedFilename;
    
                var newEnv = new contexts.Parse(importManager.context);
    
                newEnv.processImports = false;
                importManager.contents[resolvedFilename] = contents;
    
                if (currentFileInfo.reference || importOptions.reference) {
                    newFileInfo.reference = true;
                }
    
                if (importOptions.isPlugin) {
                    plugin = pluginLoader.evalPlugin(contents, newEnv, importManager, importOptions.pluginArgs, newFileInfo);
                    if (plugin instanceof LessError) {
                        fileParsedFunc(plugin, null, resolvedFilename);
                    }
                    else {
                        fileParsedFunc(null, plugin, resolvedFilename);
                    }
                } else if (importOptions.inline) {
                    fileParsedFunc(null, contents, resolvedFilename);
                } else {
    
                    // import (multiple) parse trees apparently get altered and can't be cached.
                    // TODO: investigate why this is
                    if (importManager.files[resolvedFilename]
                        && !importManager.files[resolvedFilename].options.multiple
                        && !importOptions.multiple) {
    
                        fileParsedFunc(null, importManager.files[resolvedFilename].root, resolvedFilename);
                    }
                    else {
                        new Parser(newEnv, importManager, newFileInfo).parse(contents, function (e, root) {
                            fileParsedFunc(e, root, resolvedFilename);
                        });
                    }
                }
            };
            var promise, context = utils.clone(this.context);
    
            if (tryAppendExtension) {
                context.ext = importOptions.isPlugin ? '.js' : '.less';
            }
    
            if (importOptions.isPlugin) {
                promise = pluginLoader.loadPlugin(path, currentFileInfo.currentDirectory, context, environment, fileManager);
            }
            else {
                promise = fileManager.loadFile(path, currentFileInfo.currentDirectory, context, environment,
                    function(err, loadedFile) {
                        if (err) {
                            fileParsedFunc(err);
                        } else {
                            loadFileCallback(loadedFile);
                        }
                    });
            }
            if (promise) {
                promise.then(loadFileCallback, fileParsedFunc);
            }
    
        };
        return ImportManager;
    };
    
    },{"./contexts":13,"./less-error":38,"./logger":39,"./parser/parser":44,"./utils":89,"promise":undefined}],37:[function(require,module,exports){
    module.exports = function(environment, fileManagers) {
        var SourceMapOutput, SourceMapBuilder, ParseTree, ImportManager, Environment;
    
        var initial = {
            version: [3, 9, 0],
            data: require('./data'),
            tree: require('./tree'),
            Environment: (Environment = require('./environment/environment')),
            AbstractFileManager: require('./environment/abstract-file-manager'),
            AbstractPluginLoader: require('./environment/abstract-plugin-loader'),
            environment: (environment = new Environment(environment, fileManagers)),
            visitors: require('./visitors'),
            Parser: require('./parser/parser'),
            functions: require('./functions')(environment),
            contexts: require('./contexts'),
            SourceMapOutput: (SourceMapOutput = require('./source-map-output')(environment)),
            SourceMapBuilder: (SourceMapBuilder = require('./source-map-builder')(SourceMapOutput, environment)),
            ParseTree: (ParseTree = require('./parse-tree')(SourceMapBuilder)),
            ImportManager: (ImportManager = require('./import-manager')(environment)),
            render: require('./render')(environment, ParseTree, ImportManager),
            parse: require('./parse')(environment, ParseTree, ImportManager),
            LessError: require('./less-error'),
            transformTree: require('./transform-tree'),
            utils: require('./utils'),
            PluginManager: require('./plugin-manager'),
            logger: require('./logger')
        };
    
        // Create a public API
    
        var ctor = function(t) {
            return function() {
                var obj = Object.create(t.prototype);
                t.apply(obj, Array.prototype.slice.call(arguments, 0));
                return obj;
            };
        };
        var t, api = Object.create(initial);
        for (var n in initial.tree) {
            /* eslint guard-for-in: 0 */
            t = initial.tree[n];
            if (typeof t === 'function') {
                api[n.toLowerCase()] = ctor(t);
            }
            else {
                api[n] = Object.create(null);
                for (var o in t) {
                    /* eslint guard-for-in: 0 */
                    api[n][o.toLowerCase()] = ctor(t[o]);
                }
            }
        }
    
        return api;
    };
    
    },{"./contexts":13,"./data":15,"./environment/abstract-file-manager":18,"./environment/abstract-plugin-loader":19,"./environment/environment":20,"./functions":28,"./import-manager":36,"./less-error":38,"./logger":39,"./parse":41,"./parse-tree":40,"./parser/parser":44,"./plugin-manager":45,"./render":46,"./source-map-builder":47,"./source-map-output":48,"./transform-tree":49,"./tree":67,"./utils":89,"./visitors":93}],38:[function(require,module,exports){
    var utils = require('./utils');
    /**
     * This is a centralized class of any error that could be thrown internally (mostly by the parser).
     * Besides standard .message it keeps some additional data like a path to the file where the error
     * occurred along with line and column numbers.
     *
     * @class
     * @extends Error
     * @type {module.LessError}
     *
     * @prop {string} type
     * @prop {string} filename
     * @prop {number} index
     * @prop {number} line
     * @prop {number} column
     * @prop {number} callLine
     * @prop {number} callExtract
     * @prop {string[]} extract
     *
     * @param {Object} e              - An error object to wrap around or just a descriptive object
     * @param {Object} fileContentMap - An object with file contents in 'contents' property (like importManager) @todo - move to fileManager?
     * @param {string} [currentFilename]
     */
    var LessError = module.exports = function LessError(e, fileContentMap, currentFilename) {
        Error.call(this);
    
        var filename = e.filename || currentFilename;
    
        this.message = e.message;
        this.stack = e.stack;
    
        if (fileContentMap && filename) {
            var input = fileContentMap.contents[filename],
                loc = utils.getLocation(e.index, input),
                line = loc.line,
                col  = loc.column,
                callLine = e.call && utils.getLocation(e.call, input).line,
                lines = input ? input.split('\n') : '';
    
            this.type = e.type || 'Syntax';
            this.filename = filename;
            this.index = e.index;
            this.line = typeof line === 'number' ? line + 1 : null;
            this.column = col;
    
            if (!this.line && this.stack) {
                var found = this.stack.match(/(<anonymous>|Function):(\d+):(\d+)/);
    
                if (found) {
                    if (found[2]) {
                        this.line = parseInt(found[2]) - 2;
                    }
                    if (found[3]) {
                        this.column = parseInt(found[3]);
                    }
                }
            }
    
            this.callLine = callLine + 1;
            this.callExtract = lines[callLine];
    
            this.extract = [
                lines[this.line - 2],
                lines[this.line - 1],
                lines[this.line]
            ];
    
        }
    
    };
    
    if (typeof Object.create === 'undefined') {
        var F = function () {};
        F.prototype = Error.prototype;
        LessError.prototype = new F();
    } else {
        LessError.prototype = Object.create(Error.prototype);
    }
    
    LessError.prototype.constructor = LessError;
    
    /**
     * An overridden version of the default Object.prototype.toString
     * which uses additional information to create a helpful message.
     *
     * @param {Object} options
     * @returns {string}
     */
    LessError.prototype.toString = function(options) {
        options = options || {};
    
        var message = '';
        var extract = this.extract || [];
        var error = [];
        var stylize = function (str) { return str; };
        if (options.stylize) {
            var type = typeof options.stylize;
            if (type !== 'function') {
                throw Error('options.stylize should be a function, got a ' + type + '!');
            }
            stylize = options.stylize;
        }
    
        if (this.line !== null) {
            if (typeof extract[0] === 'string') {
                error.push(stylize((this.line - 1) + ' ' + extract[0], 'grey'));
            }
    
            if (typeof extract[1] === 'string') {
                var errorTxt = this.line + ' ';
                if (extract[1]) {
                    errorTxt += extract[1].slice(0, this.column) +
                        stylize(stylize(stylize(extract[1].substr(this.column, 1), 'bold') +
                            extract[1].slice(this.column + 1), 'red'), 'inverse');
                }
                error.push(errorTxt);
            }
    
            if (typeof extract[2] === 'string') {
                error.push(stylize((this.line + 1) + ' ' + extract[2], 'grey'));
            }
            error = error.join('\n') + stylize('', 'reset') + '\n';
        }
    
        message += stylize(this.type + 'Error: ' + this.message, 'red');
        if (this.filename) {
            message += stylize(' in ', 'red') + this.filename;
        }
        if (this.line) {
            message += stylize(' on line ' + this.line + ', column ' + (this.column + 1) + ':', 'grey');
        }
    
        message += '\n' + error;
    
        if (this.callLine) {
            message += stylize('from ', 'red') + (this.filename || '') + '/n';
            message += stylize(this.callLine, 'grey') + ' ' + this.callExtract + '/n';
        }
    
        return message;
    };
    
    },{"./utils":89}],39:[function(require,module,exports){
    module.exports = {
        error: function(msg) {
            this._fireEvent('error', msg);
        },
        warn: function(msg) {
            this._fireEvent('warn', msg);
        },
        info: function(msg) {
            this._fireEvent('info', msg);
        },
        debug: function(msg) {
            this._fireEvent('debug', msg);
        },
        addListener: function(listener) {
            this._listeners.push(listener);
        },
        removeListener: function(listener) {
            for (var i = 0; i < this._listeners.length; i++) {
                if (this._listeners[i] === listener) {
                    this._listeners.splice(i, 1);
                    return;
                }
            }
        },
        _fireEvent: function(type, msg) {
            for (var i = 0; i < this._listeners.length; i++) {
                var logFunction = this._listeners[i][type];
                if (logFunction) {
                    logFunction(msg);
                }
            }
        },
        _listeners: []
    };
    
    },{}],40:[function(require,module,exports){
    var LessError = require('./less-error'),
        transformTree = require('./transform-tree'),
        logger = require('./logger');
    
    module.exports = function(SourceMapBuilder) {
        var ParseTree = function(root, imports) {
            this.root = root;
            this.imports = imports;
        };
    
        ParseTree.prototype.toCSS = function(options) {
            var evaldRoot, result = {}, sourceMapBuilder;
            try {
                evaldRoot = transformTree(this.root, options);
            } catch (e) {
                throw new LessError(e, this.imports);
            }
    
            try {
                var compress = Boolean(options.compress);
                if (compress) {
                    logger.warn('The compress option has been deprecated. We recommend you use a dedicated css minifier, for instance see less-plugin-clean-css.');
                }
    
                var toCSSOptions = {
                    compress: compress,
                    dumpLineNumbers: options.dumpLineNumbers,
                    strictUnits: Boolean(options.strictUnits),
                    numPrecision: 8};
    
                if (options.sourceMap) {
                    sourceMapBuilder = new SourceMapBuilder(options.sourceMap);
                    result.css = sourceMapBuilder.toCSS(evaldRoot, toCSSOptions, this.imports);
                } else {
                    result.css = evaldRoot.toCSS(toCSSOptions);
                }
            } catch (e) {
                throw new LessError(e, this.imports);
            }
    
            if (options.pluginManager) {
                var postProcessors = options.pluginManager.getPostProcessors();
                for (var i = 0; i < postProcessors.length; i++) {
                    result.css = postProcessors[i].process(result.css, { sourceMap: sourceMapBuilder, options: options, imports: this.imports });
                }
            }
            if (options.sourceMap) {
                result.map = sourceMapBuilder.getExternalSourceMap();
            }
    
            result.imports = [];
            for (var file in this.imports.files) {
                if (this.imports.files.hasOwnProperty(file) && file !== this.imports.rootFilename) {
                    result.imports.push(file);
                }
            }
            return result;
        };
        return ParseTree;
    };
    
    },{"./less-error":38,"./logger":39,"./transform-tree":49}],41:[function(require,module,exports){
    var PromiseConstructor,
        contexts = require('./contexts'),
        Parser = require('./parser/parser'),
        PluginManager = require('./plugin-manager'),
        LessError = require('./less-error'),
        utils = require('./utils');
    
    module.exports = function(environment, ParseTree, ImportManager) {
        var parse = function (input, options, callback) {
    
            if (typeof options === 'function') {
                callback = options;
                options = utils.copyOptions(this.options, {});
            }
            else {
                options = utils.copyOptions(this.options, options || {});
            }
    
            if (!callback) {
                if (!PromiseConstructor) {
                    PromiseConstructor = typeof Promise === 'undefined' ? require('promise') : Promise;
                }
                var self = this;
                return new PromiseConstructor(function (resolve, reject) {
                    parse.call(self, input, options, function(err, output) {
                        if (err) {
                            reject(err);
                        } else {
                            resolve(output);
                        }
                    });
                });
            } else {
                var context,
                    rootFileInfo,
                    pluginManager = new PluginManager(this, !options.reUsePluginManager);
    
                options.pluginManager = pluginManager;
    
                context = new contexts.Parse(options);
    
                if (options.rootFileInfo) {
                    rootFileInfo = options.rootFileInfo;
                } else {
                    var filename = options.filename || 'input';
                    var entryPath = filename.replace(/[^\/\\]*$/, '');
                    rootFileInfo = {
                        filename: filename,
                        rewriteUrls: context.rewriteUrls,
                        rootpath: context.rootpath || '',
                        currentDirectory: entryPath,
                        entryPath: entryPath,
                        rootFilename: filename
                    };
                    // add in a missing trailing slash
                    if (rootFileInfo.rootpath && rootFileInfo.rootpath.slice(-1) !== '/') {
                        rootFileInfo.rootpath += '/';
                    }
                }
    
                var imports = new ImportManager(this, context, rootFileInfo);
                this.importManager = imports;
    
                // TODO: allow the plugins to be just a list of paths or names
                // Do an async plugin queue like lessc
    
                if (options.plugins) {
                    options.plugins.forEach(function(plugin) {
                        var evalResult, contents;
                        if (plugin.fileContent) {
                            contents = plugin.fileContent.replace(/^\uFEFF/, '');
                            evalResult = pluginManager.Loader.evalPlugin(contents, context, imports, plugin.options, plugin.filename);
                            if (evalResult instanceof LessError) {
                                return callback(evalResult);
                            }
                        }
                        else {
                            pluginManager.addPlugin(plugin);
                        }
                    });
                }
    
                new Parser(context, imports, rootFileInfo)
                    .parse(input, function (e, root) {
                        if (e) { return callback(e); }
                        callback(null, root, imports, options);
                    }, options);
            }
        };
        return parse;
    };
    
    },{"./contexts":13,"./less-error":38,"./parser/parser":44,"./plugin-manager":45,"./utils":89,"promise":undefined}],42:[function(require,module,exports){
    // Split the input into chunks.
    module.exports = function (input, fail) {
        var len = input.length, level = 0, parenLevel = 0,
            lastOpening, lastOpeningParen, lastMultiComment, lastMultiCommentEndBrace,
            chunks = [], emitFrom = 0,
            chunkerCurrentIndex, currentChunkStartIndex, cc, cc2, matched;
    
        function emitChunk(force) {
            var len = chunkerCurrentIndex - emitFrom;
            if (((len < 512) && !force) || !len) {
                return;
            }
            chunks.push(input.slice(emitFrom, chunkerCurrentIndex + 1));
            emitFrom = chunkerCurrentIndex + 1;
        }
    
        for (chunkerCurrentIndex = 0; chunkerCurrentIndex < len; chunkerCurrentIndex++) {
            cc = input.charCodeAt(chunkerCurrentIndex);
            if (((cc >= 97) && (cc <= 122)) || (cc < 34)) {
                // a-z or whitespace
                continue;
            }
    
            switch (cc) {
                case 40:                        // (
                    parenLevel++;
                    lastOpeningParen = chunkerCurrentIndex;
                    continue;
                case 41:                        // )
                    if (--parenLevel < 0) {
                        return fail('missing opening `(`', chunkerCurrentIndex);
                    }
                    continue;
                case 59:                        // ;
                    if (!parenLevel) { emitChunk(); }
                    continue;
                case 123:                       // {
                    level++;
                    lastOpening = chunkerCurrentIndex;
                    continue;
                case 125:                       // }
                    if (--level < 0) {
                        return fail('missing opening `{`', chunkerCurrentIndex);
                    }
                    if (!level && !parenLevel) { emitChunk(); }
                    continue;
                case 92:                        // \
                    if (chunkerCurrentIndex < len - 1) { chunkerCurrentIndex++; continue; }
                    return fail('unescaped `\\`', chunkerCurrentIndex);
                case 34:
                case 39:
                case 96:                        // ", ' and `
                    matched = 0;
                    currentChunkStartIndex = chunkerCurrentIndex;
                    for (chunkerCurrentIndex = chunkerCurrentIndex + 1; chunkerCurrentIndex < len; chunkerCurrentIndex++) {
                        cc2 = input.charCodeAt(chunkerCurrentIndex);
                        if (cc2 > 96) { continue; }
                        if (cc2 == cc) { matched = 1; break; }
                        if (cc2 == 92) {        // \
                            if (chunkerCurrentIndex == len - 1) {
                                return fail('unescaped `\\`', chunkerCurrentIndex);
                            }
                            chunkerCurrentIndex++;
                        }
                    }
                    if (matched) { continue; }
                    return fail('unmatched `' + String.fromCharCode(cc) + '`', currentChunkStartIndex);
                case 47:                        // /, check for comment
                    if (parenLevel || (chunkerCurrentIndex == len - 1)) { continue; }
                    cc2 = input.charCodeAt(chunkerCurrentIndex + 1);
                    if (cc2 == 47) {
                        // //, find lnfeed
                        for (chunkerCurrentIndex = chunkerCurrentIndex + 2; chunkerCurrentIndex < len; chunkerCurrentIndex++) {
                            cc2 = input.charCodeAt(chunkerCurrentIndex);
                            if ((cc2 <= 13) && ((cc2 == 10) || (cc2 == 13))) { break; }
                        }
                    } else if (cc2 == 42) {
                        // /*, find */
                        lastMultiComment = currentChunkStartIndex = chunkerCurrentIndex;
                        for (chunkerCurrentIndex = chunkerCurrentIndex + 2; chunkerCurrentIndex < len - 1; chunkerCurrentIndex++) {
                            cc2 = input.charCodeAt(chunkerCurrentIndex);
                            if (cc2 == 125) { lastMultiCommentEndBrace = chunkerCurrentIndex; }
                            if (cc2 != 42) { continue; }
                            if (input.charCodeAt(chunkerCurrentIndex + 1) == 47) { break; }
                        }
                        if (chunkerCurrentIndex == len - 1) {
                            return fail('missing closing `*/`', currentChunkStartIndex);
                        }
                        chunkerCurrentIndex++;
                    }
                    continue;
                case 42:                       // *, check for unmatched */
                    if ((chunkerCurrentIndex < len - 1) && (input.charCodeAt(chunkerCurrentIndex + 1) == 47)) {
                        return fail('unmatched `/*`', chunkerCurrentIndex);
                    }
                    continue;
            }
        }
    
        if (level !== 0) {
            if ((lastMultiComment > lastOpening) && (lastMultiCommentEndBrace > lastMultiComment)) {
                return fail('missing closing `}` or `*/`', lastOpening);
            } else {
                return fail('missing closing `}`', lastOpening);
            }
        } else if (parenLevel !== 0) {
            return fail('missing closing `)`', lastOpeningParen);
        }
    
        emitChunk(true);
        return chunks;
    };
    
    },{}],43:[function(require,module,exports){
    var chunker = require('./chunker');
    
    module.exports = function() {
        var input,       // Less input string
            j,           // current chunk
            saveStack = [],   // holds state for backtracking
            furthest,    // furthest index the parser has gone to
            furthestPossibleErrorMessage, // if this is furthest we got to, this is the probably cause
            chunks,      // chunkified input
            current,     // current chunk
            currentPos,  // index of current chunk, in `input`
            parserInput = {};
    
        var CHARCODE_SPACE = 32,
            CHARCODE_TAB = 9,
            CHARCODE_LF = 10,
            CHARCODE_CR = 13,
            CHARCODE_PLUS = 43,
            CHARCODE_COMMA = 44,
            CHARCODE_FORWARD_SLASH = 47,
            CHARCODE_9 = 57;
    
        function skipWhitespace(length) {
            var oldi = parserInput.i, oldj = j,
                curr = parserInput.i - currentPos,
                endIndex = parserInput.i + current.length - curr,
                mem = (parserInput.i += length),
                inp = input,
                c, nextChar, comment;
    
            for (; parserInput.i < endIndex; parserInput.i++) {
                c = inp.charCodeAt(parserInput.i);
    
                if (parserInput.autoCommentAbsorb && c === CHARCODE_FORWARD_SLASH) {
                    nextChar = inp.charAt(parserInput.i + 1);
                    if (nextChar === '/') {
                        comment = {index: parserInput.i, isLineComment: true};
                        var nextNewLine = inp.indexOf('\n', parserInput.i + 2);
                        if (nextNewLine < 0) {
                            nextNewLine = endIndex;
                        }
                        parserInput.i = nextNewLine;
                        comment.text = inp.substr(comment.index, parserInput.i - comment.index);
                        parserInput.commentStore.push(comment);
                        continue;
                    } else if (nextChar === '*') {
                        var nextStarSlash = inp.indexOf('*/', parserInput.i + 2);
                        if (nextStarSlash >= 0) {
                            comment = {
                                index: parserInput.i,
                                text: inp.substr(parserInput.i, nextStarSlash + 2 - parserInput.i),
                                isLineComment: false
                            };
                            parserInput.i += comment.text.length - 1;
                            parserInput.commentStore.push(comment);
                            continue;
                        }
                    }
                    break;
                }
    
                if ((c !== CHARCODE_SPACE) && (c !== CHARCODE_LF) && (c !== CHARCODE_TAB) && (c !== CHARCODE_CR)) {
                    break;
                }
            }
    
            current = current.slice(length + parserInput.i - mem + curr);
            currentPos = parserInput.i;
    
            if (!current.length) {
                if (j < chunks.length - 1) {
                    current = chunks[++j];
                    skipWhitespace(0); // skip space at the beginning of a chunk
                    return true; // things changed
                }
                parserInput.finished = true;
            }
    
            return oldi !== parserInput.i || oldj !== j;
        }
    
        parserInput.save = function() {
            currentPos = parserInput.i;
            saveStack.push( { current: current, i: parserInput.i, j: j });
        };
        parserInput.restore = function(possibleErrorMessage) {
    
            if (parserInput.i > furthest || (parserInput.i === furthest && possibleErrorMessage && !furthestPossibleErrorMessage)) {
                furthest = parserInput.i;
                furthestPossibleErrorMessage = possibleErrorMessage;
            }
            var state = saveStack.pop();
            current = state.current;
            currentPos = parserInput.i = state.i;
            j = state.j;
        };
        parserInput.forget = function() {
            saveStack.pop();
        };
        parserInput.isWhitespace = function (offset) {
            var pos = parserInput.i + (offset || 0),
                code = input.charCodeAt(pos);
            return (code === CHARCODE_SPACE || code === CHARCODE_CR || code === CHARCODE_TAB || code === CHARCODE_LF);
        };
    
        // Specialization of $(tok)
        parserInput.$re = function(tok) {
            if (parserInput.i > currentPos) {
                current = current.slice(parserInput.i - currentPos);
                currentPos = parserInput.i;
            }
    
            var m = tok.exec(current);
            if (!m) {
                return null;
            }
    
            skipWhitespace(m[0].length);
            if (typeof m === 'string') {
                return m;
            }
    
            return m.length === 1 ? m[0] : m;
        };
    
        parserInput.$char = function(tok) {
            if (input.charAt(parserInput.i) !== tok) {
                return null;
            }
            skipWhitespace(1);
            return tok;
        };
    
        parserInput.$str = function(tok) {
            var tokLength = tok.length;
    
            // https://jsperf.com/string-startswith/21
            for (var i = 0; i < tokLength; i++) {
                if (input.charAt(parserInput.i + i) !== tok.charAt(i)) {
                    return null;
                }
            }
    
            skipWhitespace(tokLength);
            return tok;
        };
    
        parserInput.$quoted = function(loc) {
            var pos = loc || parserInput.i,
                startChar = input.charAt(pos);
    
            if (startChar !== '\'' && startChar !== '"') {
                return;
            }
            var length = input.length,
                currentPosition = pos;
    
            for (var i = 1; i + currentPosition < length; i++) {
                var nextChar = input.charAt(i + currentPosition);
                switch (nextChar) {
                    case '\\':
                        i++;
                        continue;
                    case '\r':
                    case '\n':
                        break;
                    case startChar:
                        var str = input.substr(currentPosition, i + 1);
                        if (!loc && loc !== 0) {
                            skipWhitespace(i + 1);
                            return str
                        }
                        return [startChar, str];
                    default:
                }
            }
            return null;
        };
    
        /**
         * Permissive parsing. Ignores everything except matching {} [] () and quotes
         * until matching token (outside of blocks)
         */
        parserInput.$parseUntil = function(tok) {
            var quote = '',
                returnVal = null,
                inComment = false,
                blockDepth = 0,
                blockStack = [],
                parseGroups = [],
                length = input.length,
                startPos = parserInput.i,
                lastPos = parserInput.i,
                i = parserInput.i,
                loop = true,
                testChar;
    
            if (typeof tok === 'string') {
                testChar = function(char) {
                    return char === tok;
                }
            } else {
                testChar = function(char) {
                    return tok.test(char);
                }
            }
    
            do {
                var prevChar, nextChar = input.charAt(i);
                if (blockDepth === 0 && testChar(nextChar)) {
                    returnVal = input.substr(lastPos, i - lastPos);
                    if (returnVal) {
                        parseGroups.push(returnVal);
                    }
                    else {
                        parseGroups.push(' ');
                    }
                    returnVal = parseGroups;
                    skipWhitespace(i - startPos);
                    loop = false
                } else {
                    if (inComment) {
                        if (nextChar === '*' && 
                            input.charAt(i + 1) === '/') {
                            i++;
                            blockDepth--;
                            inComment = false;
                        }
                        i++;
                        continue;
                    }
                    switch (nextChar) {
                        case '\\':
                            i++;
                            nextChar = input.charAt(i);
                            parseGroups.push(input.substr(lastPos, i - lastPos + 1));
                            lastPos = i + 1;
                            break;
                        case '/':
                            if (input.charAt(i + 1) === '*') {
                                i++;
                                inComment = true;
                                blockDepth++;
                            }
                            break;
                        case '\'':
                        case '"':
                            quote = parserInput.$quoted(i);
                            if (quote) {
                                parseGroups.push(input.substr(lastPos, i - lastPos), quote);
                                i += quote[1].length - 1;
                                lastPos = i + 1;
                            }
                            else {
                                skipWhitespace(i - startPos);
                                returnVal = nextChar;
                                loop = false;
                            }
                            break;
                        case '{':
                            blockStack.push('}');
                            blockDepth++;
                            break;
                        case '(':
                            blockStack.push(')');
                            blockDepth++;
                            break;
                        case '[':
                            blockStack.push(']');
                            blockDepth++;
                            break;
                        case '}':
                        case ')':
                        case ']':
                            var expected = blockStack.pop();
                            if (nextChar === expected) {
                                blockDepth--;
                            } else {
                                // move the parser to the error and return expected
                                skipWhitespace(i - startPos);
                                returnVal = expected;
                                loop = false;
                            }
                    }
                    i++;
                    if (i > length) {
                        loop = false;
                    }
                }
                prevChar = nextChar;
            } while (loop);
    
            return returnVal ? returnVal : null;
        }
    
        parserInput.autoCommentAbsorb = true;
        parserInput.commentStore = [];
        parserInput.finished = false;
    
        // Same as $(), but don't change the state of the parser,
        // just return the match.
        parserInput.peek = function(tok) {
            if (typeof tok === 'string') {
                // https://jsperf.com/string-startswith/21
                for (var i = 0; i < tok.length; i++) {
                    if (input.charAt(parserInput.i + i) !== tok.charAt(i)) {
                        return false;
                    }
                }
                return true;
            } else {
                return tok.test(current);
            }
        };
    
        // Specialization of peek()
        // TODO remove or change some currentChar calls to peekChar
        parserInput.peekChar = function(tok) {
            return input.charAt(parserInput.i) === tok;
        };
    
        parserInput.currentChar = function() {
            return input.charAt(parserInput.i);
        };
    
        parserInput.prevChar = function() {
            return input.charAt(parserInput.i - 1);
        };
    
        parserInput.getInput = function() {
            return input;
        };
    
        parserInput.peekNotNumeric = function() {
            var c = input.charCodeAt(parserInput.i);
            // Is the first char of the dimension 0-9, '.', '+' or '-'
            return (c > CHARCODE_9 || c < CHARCODE_PLUS) || c === CHARCODE_FORWARD_SLASH || c === CHARCODE_COMMA;
        };
    
        parserInput.start = function(str, chunkInput, failFunction) {
            input = str;
            parserInput.i = j = currentPos = furthest = 0;
    
            // chunking apparently makes things quicker (but my tests indicate
            // it might actually make things slower in node at least)
            // and it is a non-perfect parse - it can't recognise
            // unquoted urls, meaning it can't distinguish comments
            // meaning comments with quotes or {}() in them get 'counted'
            // and then lead to parse errors.
            // In addition if the chunking chunks in the wrong place we might
            // not be able to parse a parser statement in one go
            // this is officially deprecated but can be switched on via an option
            // in the case it causes too much performance issues.
            if (chunkInput) {
                chunks = chunker(str, failFunction);
            } else {
                chunks = [str];
            }
    
            current = chunks[0];
    
            skipWhitespace(0);
        };
    
        parserInput.end = function() {
            var message,
                isFinished = parserInput.i >= input.length;
    
            if (parserInput.i < furthest) {
                message = furthestPossibleErrorMessage;
                parserInput.i = furthest;
            }
            return {
                isFinished: isFinished,
                furthest: parserInput.i,
                furthestPossibleErrorMessage: message,
                furthestReachedEnd: parserInput.i >= input.length - 1,
                furthestChar: input[parserInput.i]
            };
        };
    
        return parserInput;
    };
    
    },{"./chunker":42}],44:[function(require,module,exports){
    var LessError = require('../less-error'),
        tree = require('../tree'),
        visitors = require('../visitors'),
        getParserInput = require('./parser-input'),
        utils = require('../utils'),
        functionRegistry = require('../functions/function-registry');
    
    //
    // less.js - parser
    //
    //    A relatively straight-forward predictive parser.
    //    There is no tokenization/lexing stage, the input is parsed
    //    in one sweep.
    //
    //    To make the parser fast enough to run in the browser, several
    //    optimization had to be made:
    //
    //    - Matching and slicing on a huge input is often cause of slowdowns.
    //      The solution is to chunkify the input into smaller strings.
    //      The chunks are stored in the `chunks` var,
    //      `j` holds the current chunk index, and `currentPos` holds
    //      the index of the current chunk in relation to `input`.
    //      This gives us an almost 4x speed-up.
    //
    //    - In many cases, we don't need to match individual tokens;
    //      for example, if a value doesn't hold any variables, operations
    //      or dynamic references, the parser can effectively 'skip' it,
    //      treating it as a literal.
    //      An example would be '1px solid #000' - which evaluates to itself,
    //      we don't need to know what the individual components are.
    //      The drawback, of course is that you don't get the benefits of
    //      syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
    //      and a smaller speed-up in the code-gen.
    //
    //
    //    Token matching is done with the `$` function, which either takes
    //    a terminal string or regexp, or a non-terminal function to call.
    //    It also takes care of moving all the indices forwards.
    //
    
    var Parser = function Parser(context, imports, fileInfo) {
        var parsers,
            parserInput = getParserInput();
    
        function error(msg, type) {
            throw new LessError(
                {
                    index: parserInput.i,
                    filename: fileInfo.filename,
                    type: type || 'Syntax',
                    message: msg
                },
                imports
            );
        }
    
        function expect(arg, msg) {
            // some older browsers return typeof 'function' for RegExp
            var result = (arg instanceof Function) ? arg.call(parsers) : parserInput.$re(arg);
            if (result) {
                return result;
            }
            
            error(msg || (typeof arg === 'string'
                ? 'expected \'' + arg + '\' got \'' + parserInput.currentChar() + '\''
                : 'unexpected token'));
        }
    
        // Specialization of expect()
        function expectChar(arg, msg) {
            if (parserInput.$char(arg)) {
                return arg;
            }
            error(msg || 'expected \'' + arg + '\' got \'' + parserInput.currentChar() + '\'');
        }
    
        function getDebugInfo(index) {
            var filename = fileInfo.filename;
    
            return {
                lineNumber: utils.getLocation(index, parserInput.getInput()).line + 1,
                fileName: filename
            };
        }
    
        /**
         *  Used after initial parsing to create nodes on the fly
         * 
         *  @param {String} str          - string to parse 
         *  @param {Array}  parseList    - array of parsers to run input through e.g. ["value", "important"]
         *  @param {Number} currentIndex - start number to begin indexing
         *  @param {Object} fileInfo     - fileInfo to attach to created nodes
         */
        function parseNode(str, parseList, currentIndex, fileInfo, callback) {
            var result, returnNodes = [];
            var parser = parserInput;
    
            try {
                parser.start(str, false, function fail(msg, index) {
                    callback({
                        message: msg,
                        index: index + currentIndex
                    });
                });
                for (var x = 0, p, i; (p = parseList[x]); x++) {
                    i = parser.i;
                    result = parsers[p]();
                    if (result) {
                        result._index = i + currentIndex;
                        result._fileInfo = fileInfo;
                        returnNodes.push(result);
                    }
                    else {
                        returnNodes.push(null);
                    }
                }
    
                var endInfo = parser.end();
                if (endInfo.isFinished) {
                    callback(null, returnNodes);
                }
                else {
                    callback(true, null);
                }
            } catch (e) {
                throw new LessError({
                    index: e.index + currentIndex,
                    message: e.message
                }, imports, fileInfo.filename);
            }
        }
        
        //
        // The Parser
        //
        return {
            parserInput: parserInput,
            imports: imports,
            fileInfo: fileInfo,
            parseNode: parseNode,
            //
            // Parse an input string into an abstract syntax tree,
            // @param str A string containing 'less' markup
            // @param callback call `callback` when done.
            // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply
            //
            parse: function (str, callback, additionalData) {
                var root, error = null, globalVars, modifyVars, ignored, preText = '';
    
                globalVars = (additionalData && additionalData.globalVars) ? Parser.serializeVars(additionalData.globalVars) + '\n' : '';
                modifyVars = (additionalData && additionalData.modifyVars) ? '\n' + Parser.serializeVars(additionalData.modifyVars) : '';
    
                if (context.pluginManager) {
                    var preProcessors = context.pluginManager.getPreProcessors();
                    for (var i = 0; i < preProcessors.length; i++) {
                        str = preProcessors[i].process(str, { context: context, imports: imports, fileInfo: fileInfo });
                    }
                }
    
                if (globalVars || (additionalData && additionalData.banner)) {
                    preText = ((additionalData && additionalData.banner) ? additionalData.banner : '') + globalVars;
                    ignored = imports.contentsIgnoredChars;
                    ignored[fileInfo.filename] = ignored[fileInfo.filename] || 0;
                    ignored[fileInfo.filename] += preText.length;
                }
    
                str = str.replace(/\r\n?/g, '\n');
                // Remove potential UTF Byte Order Mark
                str = preText + str.replace(/^\uFEFF/, '') + modifyVars;
                imports.contents[fileInfo.filename] = str;
    
                // Start with the primary rule.
                // The whole syntax tree is held under a Ruleset node,
                // with the `root` property set to true, so no `{}` are
                // output. The callback is called when the input is parsed.
                try {
                    parserInput.start(str, context.chunkInput, function fail(msg, index) {
                        throw new LessError({
                            index: index,
                            type: 'Parse',
                            message: msg,
                            filename: fileInfo.filename
                        }, imports);
                    });
    
                    tree.Node.prototype.parse = this;
                    root = new tree.Ruleset(null, this.parsers.primary());
                    tree.Node.prototype.rootNode = root;
                    root.root = true;
                    root.firstRoot = true;
                    root.functionRegistry = functionRegistry.inherit();
                    
                } catch (e) {
                    return callback(new LessError(e, imports, fileInfo.filename));
                }
    
                // If `i` is smaller than the `input.length - 1`,
                // it means the parser wasn't able to parse the whole
                // string, so we've got a parsing error.
                //
                // We try to extract a \n delimited string,
                // showing the line where the parse error occurred.
                // We split it up into two parts (the part which parsed,
                // and the part which didn't), so we can color them differently.
                var endInfo = parserInput.end();
                if (!endInfo.isFinished) {
    
                    var message = endInfo.furthestPossibleErrorMessage;
    
                    if (!message) {
                        message = 'Unrecognised input';
                        if (endInfo.furthestChar === '}') {
                            message += '. Possibly missing opening \'{\'';
                        } else if (endInfo.furthestChar === ')') {
                            message += '. Possibly missing opening \'(\'';
                        } else if (endInfo.furthestReachedEnd) {
                            message += '. Possibly missing something';
                        }
                    }
    
                    error = new LessError({
                        type: 'Parse',
                        message: message,
                        index: endInfo.furthest,
                        filename: fileInfo.filename
                    }, imports);
                }
    
                var finish = function (e) {
                    e = error || e || imports.error;
    
                    if (e) {
                        if (!(e instanceof LessError)) {
                            e = new LessError(e, imports, fileInfo.filename);
                        }
    
                        return callback(e);
                    }
                    else {
                        return callback(null, root);
                    }
                };
    
                if (context.processImports !== false) {
                    new visitors.ImportVisitor(imports, finish)
                        .run(root);
                } else {
                    return finish();
                }
            },
    
            //
            // Here in, the parsing rules/functions
            //
            // The basic structure of the syntax tree generated is as follows:
            //
            //   Ruleset ->  Declaration -> Value -> Expression -> Entity
            //
            // Here's some Less code:
            //
            //    .class {
            //      color: #fff;
            //      border: 1px solid #000;
            //      width: @w + 4px;
            //      > .child {...}
            //    }
            //
            // And here's what the parse tree might look like:
            //
            //     Ruleset (Selector '.class', [
            //         Declaration ("color",  Value ([Expression [Color #fff]]))
            //         Declaration ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
            //         Declaration ("width",  Value ([Expression [Operation " + " [Variable "@w"][Dimension 4px]]]))
            //         Ruleset (Selector [Element '>', '.child'], [...])
            //     ])
            //
            //  In general, most rules will try to parse a token with the `$re()` function, and if the return
            //  value is truly, will return a new node, of the relevant type. Sometimes, we need to check
            //  first, before parsing, that's when we use `peek()`.
            //
            parsers: parsers = {
                //
                // The `primary` rule is the *entry* and *exit* point of the parser.
                // The rules here can appear at any level of the parse tree.
                //
                // The recursive nature of the grammar is an interplay between the `block`
                // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
                // as represented by this simplified grammar:
                //
                //     primary  →  (ruleset | declaration)+
                //     ruleset  →  selector+ block
                //     block    →  '{' primary '}'
                //
                // Only at one point is the primary rule not called from the
                // block rule: at the root level.
                //
                primary: function () {
                    var mixin = this.mixin, root = [], node;
    
                    while (true) {
                        while (true) {
                            node = this.comment();
                            if (!node) { break; }
                            root.push(node);
                        }
                        // always process comments before deciding if finished
                        if (parserInput.finished) {
                            break;
                        }
                        if (parserInput.peek('}')) {
                            break;
                        }
    
                        node = this.extendRule();
                        if (node) {
                            root = root.concat(node);
                            continue;
                        }
    
                        node = mixin.definition() || this.declaration() || this.ruleset() ||
                            mixin.call(false, false) || this.variableCall() || this.entities.call() || this.atrule();
                        if (node) {
                            root.push(node);
                        } else {
                            var foundSemiColon = false;
                            while (parserInput.$char(';')) {
                                foundSemiColon = true;
                            }
                            if (!foundSemiColon) {
                                break;
                            }
                        }
                    }
    
                    return root;
                },
    
                // comments are collected by the main parsing mechanism and then assigned to nodes
                // where the current structure allows it
                comment: function () {
                    if (parserInput.commentStore.length) {
                        var comment = parserInput.commentStore.shift();
                        return new(tree.Comment)(comment.text, comment.isLineComment, comment.index, fileInfo);
                    }
                },
    
                //
                // Entities are tokens which can be found inside an Expression
                //
                entities: {
                    mixinLookup: function() {
                        return parsers.mixin.call(true, true);
                    },
                    //
                    // A string, which supports escaping " and '
                    //
                    //     "milky way" 'he\'s the one!'
                    //
                    quoted: function (forceEscaped) {
                        var str, index = parserInput.i, isEscaped = false;
    
                        parserInput.save();
                        if (parserInput.$char('~')) {
                            isEscaped = true;
                        } else if (forceEscaped) {
                            parserInput.restore();
                            return;
                        }
    
                        str = parserInput.$quoted();
                        if (!str) {
                            parserInput.restore();
                            return;
                        }
                        parserInput.forget();
    
                        return new(tree.Quoted)(str.charAt(0), str.substr(1, str.length - 2), isEscaped, index, fileInfo);
                    },
    
                    //
                    // A catch-all word, such as:
                    //
                    //     black border-collapse
                    //
                    keyword: function () {
                        var k = parserInput.$char('%') || parserInput.$re(/^\[?(?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+\]?/);
                        if (k) {
                            return tree.Color.fromKeyword(k) || new(tree.Keyword)(k);
                        }
                    },
    
                    //
                    // A function call
                    //
                    //     rgb(255, 0, 255)
                    //
                    // The arguments are parsed with the `entities.arguments` parser.
                    //
                    call: function () {
                        var name, args, func, index = parserInput.i;
    
                        // http://jsperf.com/case-insensitive-regex-vs-strtolower-then-regex/18
                        if (parserInput.peek(/^url\(/i)) {
                            return;
                        }
    
                        parserInput.save();
    
                        name = parserInput.$re(/^([\w-]+|%|progid:[\w\.]+)\(/);
                        if (!name) {
                            parserInput.forget(); 
                            return;
                        }
    
                        name = name[1];
                        func = this.customFuncCall(name);
                        if (func) {
                            args = func.parse();
                            if (args && func.stop) {
                                parserInput.forget();
                                return args;
                            }
                        }
    
                        args = this.arguments(args);
    
                        if (!parserInput.$char(')')) {
                            parserInput.restore('Could not parse call arguments or missing \')\'');
                            return;
                        }
    
                        parserInput.forget();
                        
                        return new(tree.Call)(name, args, index, fileInfo);
                    },
                    
                    //
                    // Parsing rules for functions with non-standard args, e.g.:
                    //
                    //     boolean(not(2 > 1))
                    //
                    //     This is a quick prototype, to be modified/improved when
                    //     more custom-parsed funcs come (e.g. `selector(...)`)
                    //
    
                    customFuncCall: function (name) {
                        /* Ideally the table is to be moved out of here for faster perf.,
                           but it's quite tricky since it relies on all these `parsers`
                           and `expect` available only here */
                        return {
                            alpha:   f(parsers.ieAlpha, true),
                            boolean: f(condition),
                            'if':    f(condition)
                        }[name.toLowerCase()];
    
                        function f(parse, stop) {
                            return {
                                parse: parse, // parsing function
                                stop:  stop   // when true - stop after parse() and return its result, 
                                              // otherwise continue for plain args
                            };
                        }
                    
                        function condition() {
                            return [expect(parsers.condition, 'expected condition')];
                        }
                    },
    
                    arguments: function (prevArgs) {
                        var argsComma = prevArgs || [],
                            argsSemiColon = [],
                            isSemiColonSeparated, value;
    
                        parserInput.save();
    
                        while (true) {
                            if (prevArgs) {
                                prevArgs = false;
                            } else {
                                value = parsers.detachedRuleset() || this.assignment() || parsers.expression();
                                if (!value) {
                                    break;
                                }
    
                                if (value.value && value.value.length == 1) {
                                    value = value.value[0];
                                }
    
                                argsComma.push(value);
                            }
    
                            if (parserInput.$char(',')) {
                                continue;
                            }
    
                            if (parserInput.$char(';') || isSemiColonSeparated) {
                                isSemiColonSeparated = true;
                                value = (argsComma.length < 1) ? argsComma[0]
                                    : new tree.Value(argsComma);
                                argsSemiColon.push(value);
                                argsComma = [];
                            }
                        }
    
                        parserInput.forget();
                        return isSemiColonSeparated ? argsSemiColon : argsComma;
                    },
                    literal: function () {
                        return this.dimension() ||
                               this.color() ||
                               this.quoted() ||
                               this.unicodeDescriptor();
                    },
    
                    // Assignments are argument entities for calls.
                    // They are present in ie filter properties as shown below.
                    //
                    //     filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
                    //
    
                    assignment: function () {
                        var key, value;
                        parserInput.save();
                        key = parserInput.$re(/^\w+(?=\s?=)/i);
                        if (!key) {
                            parserInput.restore();
                            return;
                        }
                        if (!parserInput.$char('=')) {
                            parserInput.restore();
                            return;
                        }
                        value = parsers.entity();
                        if (value) {
                            parserInput.forget();
                            return new(tree.Assignment)(key, value);
                        } else {
                            parserInput.restore();
                        }
                    },
    
                    //
                    // Parse url() tokens
                    //
                    // We use a specific rule for urls, because they don't really behave like
                    // standard function calls. The difference is that the argument doesn't have
                    // to be enclosed within a string, so it can't be parsed as an Expression.
                    //
                    url: function () {
                        var value, index = parserInput.i;
    
                        parserInput.autoCommentAbsorb = false;
    
                        if (!parserInput.$str('url(')) {
                            parserInput.autoCommentAbsorb = true;
                            return;
                        }
    
                        value = this.quoted() || this.variable() || this.property() ||
                                parserInput.$re(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) || '';
    
                        parserInput.autoCommentAbsorb = true;
    
                        expectChar(')');
    
                        return new(tree.URL)((value.value != null || 
                            value instanceof tree.Variable || 
                            value instanceof tree.Property) ?
                            value : new(tree.Anonymous)(value, index), index, fileInfo);
                    },
    
                    //
                    // A Variable entity, such as `@fink`, in
                    //
                    //     width: @fink + 2px
                    //
                    // We use a different parser for variable definitions,
                    // see `parsers.variable`.
                    //
                    variable: function () {
                        var ch, name, index = parserInput.i;
    
                        parserInput.save();
                        if (parserInput.currentChar() === '@' && (name = parserInput.$re(/^@@?[\w-]+/))) {
                            ch = parserInput.currentChar();
                            if (ch === '(' || ch === '[' && !parserInput.prevChar().match(/^\s/)) {
                                // this may be a VariableCall lookup
                                var result = parsers.variableCall(name);
                                if (result) {
                                    parserInput.forget();
                                    return result;
                                }
                            }
                            parserInput.forget();
                            return new(tree.Variable)(name, index, fileInfo);
                        }
                        parserInput.restore();
                    },
    
                    // A variable entity using the protective {} e.g. @{var}
                    variableCurly: function () {
                        var curly, index = parserInput.i;
    
                        if (parserInput.currentChar() === '@' && (curly = parserInput.$re(/^@\{([\w-]+)\}/))) {
                            return new(tree.Variable)('@' + curly[1], index, fileInfo);
                        }
                    },
                    //
                    // A Property accessor, such as `$color`, in
                    //
                    //     background-color: $color
                    //
                    property: function () {
                        var name, index = parserInput.i;
    
                        if (parserInput.currentChar() === '$' && (name = parserInput.$re(/^\$[\w-]+/))) {
                            return new(tree.Property)(name, index, fileInfo);
                        }
                    },
    
                    // A property entity useing the protective {} e.g. ${prop}
                    propertyCurly: function () {
                        var curly, index = parserInput.i;
    
                        if (parserInput.currentChar() === '$' && (curly = parserInput.$re(/^\$\{([\w-]+)\}/))) {
                            return new(tree.Property)('$' + curly[1], index, fileInfo);
                        }
                    },
                    //
                    // A Hexadecimal color
                    //
                    //     #4F3C2F
                    //
                    // `rgb` and `hsl` colors are parsed through the `entities.call` parser.
                    //
                    color: function () {
                        var rgb;
    
                        if (parserInput.currentChar() === '#' && (rgb = parserInput.$re(/^#([A-Fa-f0-9]{8}|[A-Fa-f0-9]{6}|[A-Fa-f0-9]{3,4})/))) {
                            return new(tree.Color)(rgb[1], undefined, rgb[0]);
                        }
                    },
    
                    colorKeyword: function () {
                        parserInput.save();
                        var autoCommentAbsorb = parserInput.autoCommentAbsorb;
                        parserInput.autoCommentAbsorb = false;
                        var k = parserInput.$re(/^[_A-Za-z-][_A-Za-z0-9-]+/);
                        parserInput.autoCommentAbsorb = autoCommentAbsorb;
                        if (!k) {
                            parserInput.forget();
                            return;
                        }
                        parserInput.restore();
                        var color = tree.Color.fromKeyword(k);
                        if (color) {
                            parserInput.$str(k);
                            return color;
                        }
                    },
    
                    //
                    // A Dimension, that is, a number and a unit
                    //
                    //     0.5em 95%
                    //
                    dimension: function () {
                        if (parserInput.peekNotNumeric()) {
                            return;
                        }
    
                        var value = parserInput.$re(/^([+-]?\d*\.?\d+)(%|[a-z_]+)?/i);
                        if (value) {
                            return new(tree.Dimension)(value[1], value[2]);
                        }
                    },
    
                    //
                    // A unicode descriptor, as is used in unicode-range
                    //
                    // U+0??  or U+00A1-00A9
                    //
                    unicodeDescriptor: function () {
                        var ud;
    
                        ud = parserInput.$re(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/);
                        if (ud) {
                            return new(tree.UnicodeDescriptor)(ud[0]);
                        }
                    },
    
                    //
                    // JavaScript code to be evaluated
                    //
                    //     `window.location.href`
                    //
                    javascript: function () {
                        var js, index = parserInput.i;
    
                        parserInput.save();
    
                        var escape = parserInput.$char('~');
                        var jsQuote = parserInput.$char('`');
    
                        if (!jsQuote) {
                            parserInput.restore();
                            return;
                        }
    
                        js = parserInput.$re(/^[^`]*`/);
                        if (js) {
                            parserInput.forget();
                            return new(tree.JavaScript)(js.substr(0, js.length - 1), Boolean(escape), index, fileInfo);
                        }
                        parserInput.restore('invalid javascript definition');
                    }
                },
    
                //
                // The variable part of a variable definition. Used in the `rule` parser
                //
                //     @fink:
                //
                variable: function () {
                    var name;
    
                    if (parserInput.currentChar() === '@' && (name = parserInput.$re(/^(@[\w-]+)\s*:/))) { return name[1]; }
                },
    
                //
                // Call a variable value to retrieve a detached ruleset
                // or a value from a detached ruleset's rules.
                //
                //     @fink();
                //     @fink;
                //     color: @fink[@color];
                //
                variableCall: function (parsedName) {
                    var lookups, important, i = parserInput.i,
                        inValue = !!parsedName, name = parsedName;
    
                    parserInput.save();
    
                    if (name || (parserInput.currentChar() === '@'
                        && (name = parserInput.$re(/^(@[\w-]+)(\(\s*\))?/)))) {
    
                        lookups = this.mixin.ruleLookups();
    
                        if (!lookups && ((inValue && parserInput.$str('()') !== '()') || (name[2] !== '()'))) {
                            parserInput.restore('Missing \'[...]\' lookup in variable call');
                            return;
                        }
    
                        if (!inValue) {
                            name = name[1];
                        }
    
                        if (lookups && parsers.important()) {
                            important = true;
                        }
    
                        var call = new tree.VariableCall(name, i, fileInfo);
                        if (!inValue && parsers.end()) {
                            parserInput.forget();
                            return call;
                        }
                        else {
                            parserInput.forget();
                            return new tree.NamespaceValue(call, lookups, important, i, fileInfo);
                        }
                    }
    
                    parserInput.restore();
                },
    
                //
                // extend syntax - used to extend selectors
                //
                extend: function(isRule) {
                    var elements, e, index = parserInput.i, option, extendList, extend;
    
                    if (!parserInput.$str(isRule ? '&:extend(' : ':extend(')) {
                        return;
                    }
    
                    do {
                        option = null;
                        elements = null;
                        while (!(option = parserInput.$re(/^(all)(?=\s*(\)|,))/))) {
                            e = this.element();
                            if (!e) {
                                break;
                            }
                            if (elements) {
                                elements.push(e);
                            } else {
                                elements = [ e ];
                            }
                        }
    
                        option = option && option[1];
                        if (!elements) {
                            error('Missing target selector for :extend().');
                        }
                        extend = new(tree.Extend)(new(tree.Selector)(elements), option, index, fileInfo);
                        if (extendList) {
                            extendList.push(extend);
                        } else {
                            extendList = [ extend ];
                        }
                    } while (parserInput.$char(','));
    
                    expect(/^\)/);
    
                    if (isRule) {
                        expect(/^;/);
                    }
    
                    return extendList;
                },
    
                //
                // extendRule - used in a rule to extend all the parent selectors
                //
                extendRule: function() {
                    return this.extend(true);
                },
    
                //
                // Mixins
                //
                mixin: {
                    //
                    // A Mixin call, with an optional argument list
                    //
                    //     #mixins > .square(#fff);
                    //     #mixins.square(#fff);
                    //     .rounded(4px, black);
                    //     .button;
                    //
                    // We can lookup / return a value using the lookup syntax:
                    //
                    //     color: #mixin.square(#fff)[@color];
                    //
                    // The `while` loop is there because mixins can be
                    // namespaced, but we only support the child and descendant
                    // selector for now.
                    //
                    call: function (inValue, getLookup) {
                        var s = parserInput.currentChar(), important = false, lookups,
                            index = parserInput.i, elements, args, hasParens;
    
                        if (s !== '.' && s !== '#') { return; }
    
                        parserInput.save(); // stop us absorbing part of an invalid selector
    
                        elements = this.elements();
    
                        if (elements) {
                            if (parserInput.$char('(')) {
                                args = this.args(true).args;
                                expectChar(')');
                                hasParens = true;
                            }
    
                            if (getLookup !== false) {
                                lookups = this.ruleLookups();
                            }
                            if (getLookup === true && !lookups) {
                                parserInput.restore();
                                return;
                            }
    
                            if (inValue && !lookups && !hasParens) {
                                // This isn't a valid in-value mixin call
                                parserInput.restore();
                                return;
                            }
    
                            if (!inValue && parsers.important()) {
                                important = true;
                            }
    
                            if (inValue || parsers.end()) {
                                parserInput.forget();
                                var mixin = new(tree.mixin.Call)(elements, args, index, fileInfo, !lookups && important);
                                if (lookups) {
                                    return new tree.NamespaceValue(mixin, lookups, important);
                                }
                                else {
                                    return mixin;
                                }
                            }
                        }
    
                        parserInput.restore();
                    },
                    /**
                     * Matching elements for mixins
                     * (Start with . or # and can have > )
                     */
                    elements: function() {
                        var elements, e, c, elem, elemIndex,
                            re = /^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/;
                        while (true) {
                            elemIndex = parserInput.i;
                            e = parserInput.$re(re);
                            
                            if (!e) {
                                break;
                            }
                            elem = new(tree.Element)(c, e, false, elemIndex, fileInfo);
                            if (elements) {
                                elements.push(elem);
                            } else {
                                elements = [ elem ];
                            }
                            c = parserInput.$char('>');
                        }
                        return elements;
                    },
                    args: function (isCall) {
                        var entities = parsers.entities,
                            returner = { args:null, variadic: false },
                            expressions = [], argsSemiColon = [], argsComma = [],
                            isSemiColonSeparated, expressionContainsNamed, name, nameLoop,
                            value, arg, expand, hasSep = true; 
    
                        parserInput.save();
    
                        while (true) {
                            if (isCall) {
                                arg = parsers.detachedRuleset() || parsers.expression();
                            } else {
                                parserInput.commentStore.length = 0;
                                if (parserInput.$str('...')) {
                                    returner.variadic = true;
                                    if (parserInput.$char(';') && !isSemiColonSeparated) {
                                        isSemiColonSeparated = true;
                                    }
                                    (isSemiColonSeparated ? argsSemiColon : argsComma)
                                        .push({ variadic: true });
                                    break;
                                }
                                arg = entities.variable() || entities.property() || entities.literal() || entities.keyword() || this.call(true);
                            }
    
                            if (!arg || !hasSep) {
                                break;
                            }
    
                            nameLoop = null;
                            if (arg.throwAwayComments) {
                                arg.throwAwayComments();
                            }
                            value = arg;
                            var val = null;
    
                            if (isCall) {
                                // Variable
                                if (arg.value && arg.value.length == 1) {
                                    val = arg.value[0];
                                }
                            } else {
                                val = arg;
                            }
    
                            if (val && (val instanceof tree.Variable || val instanceof tree.Property)) {
                                if (parserInput.$char(':')) {
                                    if (expressions.length > 0) {
                                        if (isSemiColonSeparated) {
                                            error('Cannot mix ; and , as delimiter types');
                                        }
                                        expressionContainsNamed = true;
                                    }
    
                                    value = parsers.detachedRuleset() || parsers.expression();
    
                                    if (!value) {
                                        if (isCall) {
                                            error('could not understand value for named argument');
                                        } else {
                                            parserInput.restore();
                                            returner.args = [];
                                            return returner;
                                        }
                                    }
                                    nameLoop = (name = val.name);
                                } else if (parserInput.$str('...')) {
                                    if (!isCall) {
                                        returner.variadic = true;
                                        if (parserInput.$char(';') && !isSemiColonSeparated) {
                                            isSemiColonSeparated = true;
                                        }
                                        (isSemiColonSeparated ? argsSemiColon : argsComma)
                                            .push({ name: arg.name, variadic: true });
                                        break;
                                    } else {
                                        expand = true;
                                    }
                                } else if (!isCall) {
                                    name = nameLoop = val.name;
                                    value = null;
                                }
                            }
    
                            if (value) {
                                expressions.push(value);
                            }
    
                            argsComma.push({ name:nameLoop, value:value, expand:expand });
    
                            if (parserInput.$char(',')) {
                                hasSep = true;
                                continue;
                            }
                            hasSep = parserInput.$char(';') === ';';
    
                            if (hasSep || isSemiColonSeparated) {
    
                                if (expressionContainsNamed) {
                                    error('Cannot mix ; and , as delimiter types');
                                }
    
                                isSemiColonSeparated = true;
    
                                if (expressions.length > 1) {
                                    value = new(tree.Value)(expressions);
                                }
                                argsSemiColon.push({ name:name, value:value, expand:expand });
    
                                name = null;
                                expressions = [];
                                expressionContainsNamed = false;
                            }
                        }
    
                        parserInput.forget();
                        returner.args = isSemiColonSeparated ? argsSemiColon : argsComma;
                        return returner;
                    },
                    //
                    // A Mixin definition, with a list of parameters
                    //
                    //     .rounded (@radius: 2px, @color) {
                    //        ...
                    //     }
                    //
                    // Until we have a finer grained state-machine, we have to
                    // do a look-ahead, to make sure we don't have a mixin call.
                    // See the `rule` function for more information.
                    //
                    // We start by matching `.rounded (`, and then proceed on to
                    // the argument list, which has optional default values.
                    // We store the parameters in `params`, with a `value` key,
                    // if there is a value, such as in the case of `@radius`.
                    //
                    // Once we've got our params list, and a closing `)`, we parse
                    // the `{...}` block.
                    //
                    definition: function () {
                        var name, params = [], match, ruleset, cond, variadic = false;
                        if ((parserInput.currentChar() !== '.' && parserInput.currentChar() !== '#') ||
                            parserInput.peek(/^[^{]*\}/)) {
                            return;
                        }
    
                        parserInput.save();
    
                        match = parserInput.$re(/^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/);
                        if (match) {
                            name = match[1];
    
                            var argInfo = this.args(false);
                            params = argInfo.args;
                            variadic = argInfo.variadic;
    
                            // .mixincall("@{a}");
                            // looks a bit like a mixin definition..
                            // also
                            // .mixincall(@a: {rule: set;});
                            // so we have to be nice and restore
                            if (!parserInput.$char(')')) {
                                parserInput.restore('Missing closing \')\'');
                                return;
                            }
    
                            parserInput.commentStore.length = 0;
    
                            if (parserInput.$str('when')) { // Guard
                                cond = expect(parsers.conditions, 'expected condition');
                            }
    
                            ruleset = parsers.block();
    
                            if (ruleset) {
                                parserInput.forget();
                                return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);
                            } else {
                                parserInput.restore();
                            }
                        } else {
                            parserInput.forget();
                        }
                    },
                
                    ruleLookups: function() {
                        var rule, args, lookups = [];
    
                        if (parserInput.currentChar() !== '[') { 
                            return;
                        }
                        
                        while (true) {
                            parserInput.save();
                            args = null;
                            rule = this.lookupValue();
                            if (!rule && rule !== '') {
                                parserInput.restore();
                                break;
                            }
                            lookups.push(rule);
                            parserInput.forget();
                        }
                        if (lookups.length > 0) {
                            return lookups;
                        }
                    },
        
                    lookupValue: function() {
                        parserInput.save();
        
                        if (!parserInput.$char('[')) { 
                            parserInput.restore();
                            return;
                        }
        
                        var name = parserInput.$re(/^(?:[@$]{0,2})[_a-zA-Z0-9-]*/);
        
                        if (!parserInput.$char(']')) {
                            parserInput.restore();
                            return;
                        } 
    
                        if (name || name === '') {
                            parserInput.forget();
                            return name;
                        }
        
                        parserInput.restore();
                    }
                },
                //
                // Entities are the smallest recognized token,
                // and can be found inside a rule's value.
                //
                entity: function () {
                    var entities = this.entities;
    
                    return this.comment() || entities.literal() || entities.variable() || entities.url() ||
                        entities.property() || entities.call() || entities.keyword() || this.mixin.call(true) ||
                        entities.javascript();
                },
    
                //
                // A Declaration terminator. Note that we use `peek()` to check for '}',
                // because the `block` rule will be expecting it, but we still need to make sure
                // it's there, if ';' was omitted.
                //
                end: function () {
                    return parserInput.$char(';') || parserInput.peek('}');
                },
    
                //
                // IE's alpha function
                //
                //     alpha(opacity=88)
                //
                ieAlpha: function () {
                    var value;
    
                    // http://jsperf.com/case-insensitive-regex-vs-strtolower-then-regex/18
                    if (!parserInput.$re(/^opacity=/i)) { return; }
                    value = parserInput.$re(/^\d+/);
                    if (!value) {
                        value = expect(parsers.entities.variable, 'Could not parse alpha');
                        value = '@{' + value.name.slice(1) + '}';
                    }
                    expectChar(')');
                    return new tree.Quoted('', 'alpha(opacity=' + value + ')');
                },
    
                //
                // A Selector Element
                //
                //     div
                //     + h1
                //     #socks
                //     input[type="text"]
                //
                // Elements are the building blocks for Selectors,
                // they are made out of a `Combinator` (see combinator rule),
                // and an element name, such as a tag a class, or `*`.
                //
                element: function () {
                    var e, c, v, index = parserInput.i;
    
                    c = this.combinator();
    
                    e = parserInput.$re(/^(?:\d+\.\d+|\d+)%/) ||
                        parserInput.$re(/^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||
                        parserInput.$char('*') || parserInput.$char('&') || this.attribute() ||
                        parserInput.$re(/^\([^&()@]+\)/) ||  parserInput.$re(/^[\.#:](?=@)/) ||
                        this.entities.variableCurly();
    
                    if (!e) {
                        parserInput.save();
                        if (parserInput.$char('(')) {
                            if ((v = this.selector(false)) && parserInput.$char(')')) {
                                e = new(tree.Paren)(v);
                                parserInput.forget();
                            } else {
                                parserInput.restore('Missing closing \')\'');
                            }
                        } else {
                            parserInput.forget();
                        }
                    }
    
                    if (e) { return new(tree.Element)(c, e, e instanceof tree.Variable, index, fileInfo); }
                },
    
                //
                // Combinators combine elements together, in a Selector.
                //
                // Because our parser isn't white-space sensitive, special care
                // has to be taken, when parsing the descendant combinator, ` `,
                // as it's an empty space. We have to check the previous character
                // in the input, to see if it's a ` ` character. More info on how
                // we deal with this in *combinator.js*.
                //
                combinator: function () {
                    var c = parserInput.currentChar();
    
                    if (c === '/') {
                        parserInput.save();
                        var slashedCombinator = parserInput.$re(/^\/[a-z]+\//i);
                        if (slashedCombinator) {
                            parserInput.forget();
                            return new(tree.Combinator)(slashedCombinator);
                        }
                        parserInput.restore();
                    }
    
                    if (c === '>' || c === '+' || c === '~' || c === '|' || c === '^') {
                        parserInput.i++;
                        if (c === '^' && parserInput.currentChar() === '^') {
                            c = '^^';
                            parserInput.i++;
                        }
                        while (parserInput.isWhitespace()) { parserInput.i++; }
                        return new(tree.Combinator)(c);
                    } else if (parserInput.isWhitespace(-1)) {
                        return new(tree.Combinator)(' ');
                    } else {
                        return new(tree.Combinator)(null);
                    }
                },
                //
                // A CSS Selector
                // with less extensions e.g. the ability to extend and guard
                //
                //     .class > div + h1
                //     li a:hover
                //
                // Selectors are made out of one or more Elements, see above.
                //
                selector: function (isLess) {
                    var index = parserInput.i, elements, extendList, c, e, allExtends, when, condition;
                    isLess = isLess !== false;
                    while ((isLess && (extendList = this.extend())) || (isLess && (when = parserInput.$str('when'))) || (e = this.element())) {
                        if (when) {
                            condition = expect(this.conditions, 'expected condition');
                        } else if (condition) {
                            error('CSS guard can only be used at the end of selector');
                        } else if (extendList) {
                            if (allExtends) {
                                allExtends = allExtends.concat(extendList);
                            } else {
                                allExtends = extendList;
                            }
                        } else {
                            if (allExtends) { error('Extend can only be used at the end of selector'); }
                            c = parserInput.currentChar();
                            if (elements) {
                                elements.push(e);
                            } else {
                                elements = [ e ];
                            }
                            e = null;
                        }
                        if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') {
                            break;
                        }
                    }
    
                    if (elements) { return new(tree.Selector)(elements, allExtends, condition, index, fileInfo); }
                    if (allExtends) { error('Extend must be used to extend a selector, it cannot be used on its own'); }
                },
                selectors: function () {
                    var s, selectors;
                    while (true) {
                        s = this.selector();
                        if (!s) {
                            break;
                        }
                        if (selectors) {
                            selectors.push(s);
                        } else {
                            selectors = [ s ];
                        }
                        parserInput.commentStore.length = 0;
                        if (s.condition && selectors.length > 1) {
                            error("Guards are only currently allowed on a single selector.");
                        }
                        if (!parserInput.$char(',')) { break; }
                        if (s.condition) {
                            error("Guards are only currently allowed on a single selector.");
                        }
                        parserInput.commentStore.length = 0;
                    }
                    return selectors;
                },
                attribute: function () {
                    if (!parserInput.$char('[')) { return; }
    
                    var entities = this.entities,
                        key, val, op;
    
                    if (!(key = entities.variableCurly())) {
                        key = expect(/^(?:[_A-Za-z0-9-\*]*\|)?(?:[_A-Za-z0-9-]|\\.)+/);
                    }
    
                    op = parserInput.$re(/^[|~*$^]?=/);
                    if (op) {
                        val = entities.quoted() || parserInput.$re(/^[0-9]+%/) || parserInput.$re(/^[\w-]+/) || entities.variableCurly();
                    }
    
                    expectChar(']');
    
                    return new(tree.Attribute)(key, op, val);
                },
    
                //
                // The `block` rule is used by `ruleset` and `mixin.definition`.
                // It's a wrapper around the `primary` rule, with added `{}`.
                //
                block: function () {
                    var content;
                    if (parserInput.$char('{') && (content = this.primary()) && parserInput.$char('}')) {
                        return content;
                    }
                },
    
                blockRuleset: function() {
                    var block = this.block();
    
                    if (block) {
                        block = new tree.Ruleset(null, block);
                    }
                    return block;
                },
    
                detachedRuleset: function() {
                    var argInfo, params, variadic;
    
                    parserInput.save();
                    if (parserInput.$re(/^[.#]\(/)) {
                        /**
                         * DR args currently only implemented for each() function, and not 
                         * yet settable as `@dr: #(@arg) {}`
                         * This should be done when DRs are merged with mixins.
                         * See: https://github.com/less/less-meta/issues/16
                         */
                        argInfo = this.mixin.args(false);
                        params = argInfo.args;
                        variadic = argInfo.variadic;
                        if (!parserInput.$char(')')) {
                            parserInput.restore();
                            return;
                        }
                    }
                    var blockRuleset = this.blockRuleset();
                    if (blockRuleset) {
                        parserInput.forget();
                        if (params) {
                            return new tree.mixin.Definition(null, params, blockRuleset, null, variadic);
                        }
                        return new tree.DetachedRuleset(blockRuleset);
                    }
                    parserInput.restore();
                },
    
                //
                // div, .class, body > p {...}
                //
                ruleset: function () {
                    var selectors, rules, debugInfo;
    
                    parserInput.save();
    
                    if (context.dumpLineNumbers) {
                        debugInfo = getDebugInfo(parserInput.i);
                    }
    
                    selectors = this.selectors();
    
                    if (selectors && (rules = this.block())) {
                        parserInput.forget();
                        var ruleset = new(tree.Ruleset)(selectors, rules, context.strictImports);
                        if (context.dumpLineNumbers) {
                            ruleset.debugInfo = debugInfo;
                        }
                        return ruleset;
                    } else {
                        parserInput.restore();
                    }
                },
                declaration: function () {
                    var name, value, index = parserInput.i, hasDR,
                        c = parserInput.currentChar(), important, merge, isVariable;
    
                    if (c === '.' || c === '#' || c === '&' || c === ':') { return; }
    
                    parserInput.save();
    
                    name = this.variable() || this.ruleProperty();
                    if (name) {
                        isVariable = typeof name === 'string';
    
                        if (isVariable) {
                            value = this.detachedRuleset();
                            if (value) {
                                hasDR = true;
                            }
                        }
    
                        parserInput.commentStore.length = 0;
                        if (!value) {
                            // a name returned by this.ruleProperty() is always an array of the form:
                            // [string-1, ..., string-n, ""] or [string-1, ..., string-n, "+"]
                            // where each item is a tree.Keyword or tree.Variable
                            merge = !isVariable && name.length > 1 && name.pop().value;
    
                            // Custom property values get permissive parsing
                            if (name[0].value && name[0].value.slice(0, 2) === '--') {
                                value = this.permissiveValue();
                            }
                            // Try to store values as anonymous
                            // If we need the value later we'll re-parse it in ruleset.parseValue
                            else {
                                value = this.anonymousValue();
                            }
                            if (value) {
                                parserInput.forget();
                                // anonymous values absorb the end ';' which is required for them to work
                                return new (tree.Declaration)(name, value, false, merge, index, fileInfo);
                            }
    
                            if (!value) {
                                value = this.value();
                            }
    
                            if (value) {
                                important = this.important();
                            } else if (isVariable) {
                                // As a last resort, try permissiveValue
                                value = this.permissiveValue();
                            }
                        }
    
                        if (value && (this.end() || hasDR)) {
                            parserInput.forget();
                            return new (tree.Declaration)(name, value, important, merge, index, fileInfo);
                        }
                        else {
                            parserInput.restore();
                        }
                    } else {
                        parserInput.restore();
                    }
                },
                anonymousValue: function () {
                    var index = parserInput.i;
                    var match = parserInput.$re(/^([^.#@\$+\/'"*`(;{}-]*);/);
                    if (match) {
                        return new(tree.Anonymous)(match[1], index);
                    }
                },
                /**
                 * Used for custom properties, at-rules, and variables (as fallback)
                 * Parses almost anything inside of {} [] () "" blocks
                 * until it reaches outer-most tokens.
                 * 
                 * First, it will try to parse comments and entities to reach
                 * the end. This is mostly like the Expression parser except no
                 * math is allowed.
                 */
                permissiveValue: function (untilTokens) {
                    var i, e, done, value, 
                        tok = untilTokens || ';',
                        index = parserInput.i, result = [];
    
                    function testCurrentChar() {
                        var char = parserInput.currentChar();
                        if (typeof tok === 'string') {
                            return char === tok;
                        } else {
                            return tok.test(char);
                        }
                    }
                    if (testCurrentChar()) {
                        return;
                    }
                    value = [];
                    do {
                        e = this.comment();
                        if (e) {
                            value.push(e);
                            continue;
                        }
                        e = this.entity();
                        if (e) {
                            value.push(e);
                        }
                    } while (e);
    
                    done = testCurrentChar();
                    
                    if (value.length > 0) {
                        value = new(tree.Expression)(value);
                        if (done) {
                            return value;
                        }
                        else {
                            result.push(value);
                        }
                        // Preserve space before $parseUntil as it will not
                        if (parserInput.prevChar() === ' ') {
                            result.push(new tree.Anonymous(' ', index));
                        }
                    }
                    parserInput.save();
                    
                    value = parserInput.$parseUntil(tok);
    
                    if (value) {
                        if (typeof value === 'string') {
                            error('Expected \'' + value + '\'', 'Parse');
                        }
                        if (value.length === 1 && value[0] === ' ') {
                            parserInput.forget();
                            return new tree.Anonymous('', index);
                        }
                        var item;
                        for (i = 0; i < value.length; i++) {
                            item = value[i];
                            if (Array.isArray(item)) {
                                // Treat actual quotes as normal quoted values
                                result.push(new tree.Quoted(item[0], item[1], true, index, fileInfo));
                            }
                            else {
                                if (i === value.length - 1) {
                                    item = item.trim();
                                }
                                // Treat like quoted values, but replace vars like unquoted expressions
                                var quote = new tree.Quoted('\'', item, true, index, fileInfo);
                                quote.variableRegex = /@([\w-]+)/g;
                                quote.propRegex = /\$([\w-]+)/g;
                                result.push(quote);
                            }
                        }
                        parserInput.forget();
                        return new tree.Expression(result, true);
                    }
                    parserInput.restore();
                },
    
                //
                // An @import atrule
                //
                //     @import "lib";
                //
                // Depending on our environment, importing is done differently:
                // In the browser, it's an XHR request, in Node, it would be a
                // file-system operation. The function used for importing is
                // stored in `import`, which we pass to the Import constructor.
                //
                'import': function () {
                    var path, features, index = parserInput.i;
    
                    var dir = parserInput.$re(/^@import?\s+/);
    
                    if (dir) {
                        var options = (dir ? this.importOptions() : null) || {};
    
                        if ((path = this.entities.quoted() || this.entities.url())) {
                            features = this.mediaFeatures();
    
                            if (!parserInput.$char(';')) {
                                parserInput.i = index;
                                error('missing semi-colon or unrecognised media features on import');
                            }
                            features = features && new(tree.Value)(features);
                            return new(tree.Import)(path, features, options, index, fileInfo);
                        }
                        else {
                            parserInput.i = index;
                            error('malformed import statement');
                        }
                    }
                },
    
                importOptions: function() {
                    var o, options = {}, optionName, value;
    
                    // list of options, surrounded by parens
                    if (!parserInput.$char('(')) { return null; }
                    do {
                        o = this.importOption();
                        if (o) {
                            optionName = o;
                            value = true;
                            switch (optionName) {
                                case 'css':
                                    optionName = 'less';
                                    value = false;
                                    break;
                                case 'once':
                                    optionName = 'multiple';
                                    value = false;
                                    break;
                            }
                            options[optionName] = value;
                            if (!parserInput.$char(',')) { break; }
                        }
                    } while (o);
                    expectChar(')');
                    return options;
                },
    
                importOption: function() {
                    var opt = parserInput.$re(/^(less|css|multiple|once|inline|reference|optional)/);
                    if (opt) {
                        return opt[1];
                    }
                },
    
                mediaFeature: function () {
                    var entities = this.entities, nodes = [], e, p;
                    parserInput.save();
                    do {
                        e = entities.keyword() || entities.variable() || entities.mixinLookup();
                        if (e) {
                            nodes.push(e);
                        } else if (parserInput.$char('(')) {
                            p = this.property();
                            e = this.value();
                            if (parserInput.$char(')')) {
                                if (p && e) {
                                    nodes.push(new(tree.Paren)(new(tree.Declaration)(p, e, null, null, parserInput.i, fileInfo, true)));
                                } else if (e) {
                                    nodes.push(new(tree.Paren)(e));
                                } else {
                                    error('badly formed media feature definition');
                                }
                            } else {
                                error('Missing closing \')\'', 'Parse');
                            }
                        }
                    } while (e);
    
                    parserInput.forget();
                    if (nodes.length > 0) {
                        return new(tree.Expression)(nodes);
                    }
                },
    
                mediaFeatures: function () {
                    var entities = this.entities, features = [], e;
                    do {
                        e = this.mediaFeature();
                        if (e) {
                            features.push(e);
                            if (!parserInput.$char(',')) { break; }
                        } else {
                            e = entities.variable() || entities.mixinLookup();
                            if (e) {
                                features.push(e);
                                if (!parserInput.$char(',')) { break; }
                            }
                        }
                    } while (e);
    
                    return features.length > 0 ? features : null;
                },
    
                media: function () {
                    var features, rules, media, debugInfo, index = parserInput.i;
    
                    if (context.dumpLineNumbers) {
                        debugInfo = getDebugInfo(index);
                    }
    
                    parserInput.save();
    
                    if (parserInput.$str('@media')) {
                        features = this.mediaFeatures();
    
                        rules = this.block();
    
                        if (!rules) {
                            error('media definitions require block statements after any features');
                        }
    
                        parserInput.forget();
    
                        media = new(tree.Media)(rules, features, index, fileInfo);
                        if (context.dumpLineNumbers) {
                            media.debugInfo = debugInfo;
                        }
    
                        return media;
                    }
    
                    parserInput.restore();
                },
    
                //
    
                // A @plugin directive, used to import plugins dynamically.
                //
                //     @plugin (args) "lib";
                //
                plugin: function () {
                    var path, args, options,
                        index = parserInput.i,
                        dir   = parserInput.$re(/^@plugin?\s+/);
    
                    if (dir) {
                        args = this.pluginArgs();
    
                        if (args) {
                            options = {
                                pluginArgs: args,
                                isPlugin: true
                            };
                        }
                        else {
                            options = { isPlugin: true };
                        }
    
                        if ((path = this.entities.quoted() || this.entities.url())) {
    
                            if (!parserInput.$char(';')) {
                                parserInput.i = index;
                                error('missing semi-colon on @plugin');
                            }
                            return new(tree.Import)(path, null, options, index, fileInfo);
                        }
                        else {
                            parserInput.i = index;
                            error('malformed @plugin statement');
                        }
                    }
                },
    
                pluginArgs: function() {
                    // list of options, surrounded by parens
                    parserInput.save();
                    if (!parserInput.$char('(')) {
                        parserInput.restore();
                        return null;
                    }
                    var args = parserInput.$re(/^\s*([^\);]+)\)\s*/);
                    if (args[1]) {
                        parserInput.forget();
                        return args[1].trim();
                    }
                    else { 
                        parserInput.restore();
                        return null;
                    }
                },
    
                //
                // A CSS AtRule
                //
                //     @charset "utf-8";
                //
                atrule: function () {
                    var index = parserInput.i, name, value, rules, nonVendorSpecificName,
                        hasIdentifier, hasExpression, hasUnknown, hasBlock = true, isRooted = true;
    
                    if (parserInput.currentChar() !== '@') { return; }
    
                    value = this['import']() || this.plugin() || this.media();
                    if (value) {
                        return value;
                    }
    
                    parserInput.save();
    
                    name = parserInput.$re(/^@[a-z-]+/);
    
                    if (!name) { return; }
    
                    nonVendorSpecificName = name;
                    if (name.charAt(1) == '-' && name.indexOf('-', 2) > 0) {
                        nonVendorSpecificName = '@' + name.slice(name.indexOf('-', 2) + 1);
                    }
    
                    switch (nonVendorSpecificName) {
                        case '@charset':
                            hasIdentifier = true;
                            hasBlock = false;
                            break;
                        case '@namespace':
                            hasExpression = true;
                            hasBlock = false;
                            break;
                        case '@keyframes':
                        case '@counter-style':
                            hasIdentifier = true;
                            break;
                        case '@document':
                        case '@supports':
                            hasUnknown = true;
                            isRooted = false;
                            break;
                        default:
                            hasUnknown = true;
                            break;
                    }
    
                    parserInput.commentStore.length = 0;
    
                    if (hasIdentifier) {
                        value = this.entity();
                        if (!value) {
                            error('expected ' + name + ' identifier');
                        }
                    } else if (hasExpression) {
                        value = this.expression();
                        if (!value) {
                            error('expected ' + name + ' expression');
                        }
                    } else if (hasUnknown) {
                        value = this.permissiveValue(/^[{;]/);
                        hasBlock = (parserInput.currentChar() === '{');
                        if (!value) {
                            if (!hasBlock && parserInput.currentChar() !== ';') {
                                error(name + ' rule is missing block or ending semi-colon');
                            }
                        }
                        else if (!value.value) {
                            value = null;
                        }
                    }
    
                    if (hasBlock) {
                        rules = this.blockRuleset();
                    }
    
                    if (rules || (!hasBlock && value && parserInput.$char(';'))) {
                        parserInput.forget();
                        return new (tree.AtRule)(name, value, rules, index, fileInfo,
                            context.dumpLineNumbers ? getDebugInfo(index) : null,
                            isRooted
                        );
                    }
    
                    parserInput.restore('at-rule options not recognised');
                },
    
                //
                // A Value is a comma-delimited list of Expressions
                //
                //     font-family: Baskerville, Georgia, serif;
                //
                // In a Rule, a Value represents everything after the `:`,
                // and before the `;`.
                //
                value: function () {
                    var e, expressions = [], index = parserInput.i;
    
                    do {
                        e = this.expression();
                        if (e) {
                            expressions.push(e);
                            if (!parserInput.$char(',')) { break; }
                        }
                    } while (e);
    
                    if (expressions.length > 0) {
                        return new(tree.Value)(expressions, index);
                    }
                },
                important: function () {
                    if (parserInput.currentChar() === '!') {
                        return parserInput.$re(/^! *important/);
                    }
                },
                sub: function () {
                    var a, e;
    
                    parserInput.save();
                    if (parserInput.$char('(')) {
                        a = this.addition();
                        if (a && parserInput.$char(')')) {
                            parserInput.forget();
                            e = new(tree.Expression)([a]);
                            e.parens = true;
                            return e;
                        }
                        parserInput.restore('Expected \')\'');
                        return;
                    }
                    parserInput.restore();
                },
                multiplication: function () {
                    var m, a, op, operation, isSpaced;
                    m = this.operand();
                    if (m) {
                        isSpaced = parserInput.isWhitespace(-1);
                        while (true) {
                            if (parserInput.peek(/^\/[*\/]/)) {
                                break;
                            }
    
                            parserInput.save();
    
                            op = parserInput.$char('/') || parserInput.$char('*') || parserInput.$str('./');
    
                            if (!op) { parserInput.forget(); break; }
    
                            a = this.operand();
    
                            if (!a) { parserInput.restore(); break; }
                            parserInput.forget();
    
                            m.parensInOp = true;
                            a.parensInOp = true;
                            operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
                            isSpaced = parserInput.isWhitespace(-1);
                        }
                        return operation || m;
                    }
                },
                addition: function () {
                    var m, a, op, operation, isSpaced;
                    m = this.multiplication();
                    if (m) {
                        isSpaced = parserInput.isWhitespace(-1);
                        while (true) {
                            op = parserInput.$re(/^[-+]\s+/) || (!isSpaced && (parserInput.$char('+') || parserInput.$char('-')));
                            if (!op) {
                                break;
                            }
                            a = this.multiplication();
                            if (!a) {
                                break;
                            }
    
                            m.parensInOp = true;
                            a.parensInOp = true;
                            operation = new(tree.Operation)(op, [operation || m, a], isSpaced);
                            isSpaced = parserInput.isWhitespace(-1);
                        }
                        return operation || m;
                    }
                },
                conditions: function () {
                    var a, b, index = parserInput.i, condition;
    
                    a = this.condition(true);
                    if (a) {
                        while (true) {
                            if (!parserInput.peek(/^,\s*(not\s*)?\(/) || !parserInput.$char(',')) {
                                break;
                            }
                            b = this.condition(true);
                            if (!b) {
                                break;
                            }
                            condition = new(tree.Condition)('or', condition || a, b, index);
                        }
                        return condition || a;
                    }
                },
                condition: function (needsParens) {
                    var result, logical, next;
                    function or() {
                        return parserInput.$str('or');
                    }
    
                    result = this.conditionAnd(needsParens);
                    if (!result) {
                        return ;
                    }
                    logical = or();
                    if (logical) {
                        next = this.condition(needsParens);
                        if (next) {
                            result = new(tree.Condition)(logical, result, next);
                        } else {
                            return ;
                        }
                    }
                    return result;
                },
                conditionAnd: function (needsParens) {
                    var result, logical, next, self = this;
                    function insideCondition() {
                        var cond = self.negatedCondition(needsParens) || self.parenthesisCondition(needsParens);
                        if (!cond && !needsParens) {
                            return self.atomicCondition(needsParens);
                        }
                        return cond;
                    }
                    function and() {
                        return parserInput.$str('and');
                    }
    
                    result = insideCondition();
                    if (!result) {
                        return ;
                    }
                    logical = and();
                    if (logical) {
                        next = this.conditionAnd(needsParens);
                        if (next) {
                            result = new(tree.Condition)(logical, result, next);
                        } else {
                            return ;
                        }
                    }
                    return result;
                },
                negatedCondition: function (needsParens) {
                    if (parserInput.$str('not')) {
                        var result = this.parenthesisCondition(needsParens);
                        if (result) {
                            result.negate = !result.negate;
                        }
                        return result;
                    }
                },
                parenthesisCondition: function (needsParens) {
                    function tryConditionFollowedByParenthesis(me) {
                        var body;
                        parserInput.save();
                        body = me.condition(needsParens);
                        if (!body) {
                            parserInput.restore();
                            return ;
                        }
                        if (!parserInput.$char(')')) {
                            parserInput.restore();
                            return ;
                        }
                        parserInput.forget();
                        return body;
                    }
    
                    var body;
                    parserInput.save();
                    if (!parserInput.$str('(')) {
                        parserInput.restore();
                        return ;
                    }
                    body = tryConditionFollowedByParenthesis(this);
                    if (body) {
                        parserInput.forget();
                        return body;
                    }
    
                    body = this.atomicCondition(needsParens);
                    if (!body) {
                        parserInput.restore();
                        return ;
                    }
                    if (!parserInput.$char(')')) {
                        parserInput.restore('expected \')\' got \'' + parserInput.currentChar() + '\'');
                        return ;
                    }
                    parserInput.forget();
                    return body;
                },
                atomicCondition: function (needsParens) {
                    var entities = this.entities, index = parserInput.i, a, b, c, op;
    
                    function cond() {
                        return this.addition() || entities.keyword() || entities.quoted() || entities.mixinLookup();
                    }
                    cond = cond.bind(this);
    
                    a = cond();
                    if (a) {
                        if (parserInput.$char('>')) {
                            if (parserInput.$char('=')) {
                                op = '>=';
                            } else {
                                op = '>';
                            }
                        } else
                        if (parserInput.$char('<')) {
                            if (parserInput.$char('=')) {
                                op = '<=';
                            } else {
                                op = '<';
                            }
                        } else
                        if (parserInput.$char('=')) {
                            if (parserInput.$char('>')) {
                                op = '=>';
                            } else if (parserInput.$char('<')) {
                                op = '=<';
                            } else {
                                op = '=';
                            }
                        }
                        if (op) {
                            b = cond();
                            if (b) {
                                c = new(tree.Condition)(op, a, b, index, false);
                            } else {
                                error('expected expression');
                            }
                        } else {
                            c = new(tree.Condition)('=', a, new(tree.Keyword)('true'), index, false);
                        }
                        return c;
                    }
                },
    
                //
                // An operand is anything that can be part of an operation,
                // such as a Color, or a Variable
                //
                operand: function () {
                    var entities = this.entities, negate;
    
                    if (parserInput.peek(/^-[@\$\(]/)) {
                        negate = parserInput.$char('-');
                    }
    
                    var o = this.sub() || entities.dimension() ||
                            entities.color() || entities.variable() ||
                            entities.property() || entities.call() ||
                            entities.quoted(true) || entities.colorKeyword() ||
                            entities.mixinLookup();
    
                    if (negate) {
                        o.parensInOp = true;
                        o = new(tree.Negative)(o);
                    }
    
                    return o;
                },
    
                //
                // Expressions either represent mathematical operations,
                // or white-space delimited Entities.
                //
                //     1px solid black
                //     @var * 2
                //
                expression: function () {
                    var entities = [], e, delim, index = parserInput.i;
    
                    do {
                        e = this.comment();
                        if (e) {
                            entities.push(e);
                            continue;
                        }
                        e = this.addition() || this.entity();
                        if (e) {
                            entities.push(e);
                            // operations do not allow keyword "/" dimension (e.g. small/20px) so we support that here
                            if (!parserInput.peek(/^\/[\/*]/)) {
                                delim = parserInput.$char('/');
                                if (delim) {
                                    entities.push(new(tree.Anonymous)(delim, index));
                                }
                            }
                        }
                    } while (e);
                    if (entities.length > 0) {
                        return new(tree.Expression)(entities);
                    }
                },
                property: function () {
                    var name = parserInput.$re(/^(\*?-?[_a-zA-Z0-9-]+)\s*:/);
                    if (name) {
                        return name[1];
                    }
                },
                ruleProperty: function () {
                    var name = [], index = [], s, k;
    
                    parserInput.save();
    
                    var simpleProperty = parserInput.$re(/^([_a-zA-Z0-9-]+)\s*:/);
                    if (simpleProperty) {
                        name = [new(tree.Keyword)(simpleProperty[1])];
                        parserInput.forget();
                        return name;
                    }
    
                    function match(re) {
                        var i = parserInput.i,
                            chunk = parserInput.$re(re);
                        if (chunk) {
                            index.push(i);
                            return name.push(chunk[1]);
                        }
                    }
    
                    match(/^(\*?)/);
                    while (true) {
                        if (!match(/^((?:[\w-]+)|(?:[@\$]\{[\w-]+\}))/)) {
                            break;
                        }
                    }
    
                    if ((name.length > 1) && match(/^((?:\+_|\+)?)\s*:/)) {
                        parserInput.forget();
    
                        // at last, we have the complete match now. move forward,
                        // convert name particles to tree objects and return:
                        if (name[0] === '') {
                            name.shift();
                            index.shift();
                        }
                        for (k = 0; k < name.length; k++) {
                            s = name[k];
                            name[k] = (s.charAt(0) !== '@' && s.charAt(0) !== '$') ?
                                new(tree.Keyword)(s) :
                                (s.charAt(0) === '@' ?
                                    new(tree.Variable)('@' + s.slice(2, -1), index[k], fileInfo) :
                                    new(tree.Property)('$' + s.slice(2, -1), index[k], fileInfo));
                        }
                        return name;
                    }
                    parserInput.restore();
                }
            }
        };
    };
    Parser.serializeVars = function(vars) {
        var s = '';
    
        for (var name in vars) {
            if (Object.hasOwnProperty.call(vars, name)) {
                var value = vars[name];
                s += ((name[0] === '@') ? '' : '@') + name + ': ' + value +
                    ((String(value).slice(-1) === ';') ? '' : ';');
            }
        }
    
        return s;
    };
    
    module.exports = Parser;
    
    },{"../functions/function-registry":27,"../less-error":38,"../tree":67,"../utils":89,"../visitors":93,"./parser-input":43}],45:[function(require,module,exports){
    /**
     * Plugin Manager
     */
    var PluginManager = function(less) {
        this.less = less;
        this.visitors = [];
        this.preProcessors = [];
        this.postProcessors = [];
        this.installedPlugins = [];
        this.fileManagers = [];
        this.iterator = -1;
        this.pluginCache = {};
        this.Loader = new less.PluginLoader(less);
    };
    
    var pm, PluginManagerFactory = function(less, newFactory) {
            if (newFactory || !pm) {
                pm = new PluginManager(less);
            }
            return pm;
        };
    
    /**
     * Adds all the plugins in the array
     * @param {Array} plugins
     */
    PluginManager.prototype.addPlugins = function(plugins) {
        if (plugins) {
            for (var i = 0; i < plugins.length; i++) {
                this.addPlugin(plugins[i]);
            }
        }
    };
    /**
     *
     * @param plugin
     * @param {String} filename
     */
    PluginManager.prototype.addPlugin = function(plugin, filename, functionRegistry) {
        this.installedPlugins.push(plugin);
        if (filename) {
            this.pluginCache[filename] = plugin;
        }
        if (plugin.install) {
            plugin.install(this.less, this, functionRegistry || this.less.functions.functionRegistry);
        }
    };
    /**
     *
     * @param filename
     */
    PluginManager.prototype.get = function(filename) {
        return this.pluginCache[filename];
    };
    
    /**
     * Adds a visitor. The visitor object has options on itself to determine
     * when it should run.
     * @param visitor
     */
    PluginManager.prototype.addVisitor = function(visitor) {
        this.visitors.push(visitor);
    };
    /**
     * Adds a pre processor object
     * @param {object} preProcessor
     * @param {number} priority - guidelines 1 = before import, 1000 = import, 2000 = after import
     */
    PluginManager.prototype.addPreProcessor = function(preProcessor, priority) {
        var indexToInsertAt;
        for (indexToInsertAt = 0; indexToInsertAt < this.preProcessors.length; indexToInsertAt++) {
            if (this.preProcessors[indexToInsertAt].priority >= priority) {
                break;
            }
        }
        this.preProcessors.splice(indexToInsertAt, 0, {preProcessor: preProcessor, priority: priority});
    };
    /**
     * Adds a post processor object
     * @param {object} postProcessor
     * @param {number} priority - guidelines 1 = before compression, 1000 = compression, 2000 = after compression
     */
    PluginManager.prototype.addPostProcessor = function(postProcessor, priority) {
        var indexToInsertAt;
        for (indexToInsertAt = 0; indexToInsertAt < this.postProcessors.length; indexToInsertAt++) {
            if (this.postProcessors[indexToInsertAt].priority >= priority) {
                break;
            }
        }
        this.postProcessors.splice(indexToInsertAt, 0, {postProcessor: postProcessor, priority: priority});
    };
    /**
     *
     * @param manager
     */
    PluginManager.prototype.addFileManager = function(manager) {
        this.fileManagers.push(manager);
    };
    /**
     *
     * @returns {Array}
     * @private
     */
    PluginManager.prototype.getPreProcessors = function() {
        var preProcessors = [];
        for (var i = 0; i < this.preProcessors.length; i++) {
            preProcessors.push(this.preProcessors[i].preProcessor);
        }
        return preProcessors;
    };
    /**
     *
     * @returns {Array}
     * @private
     */
    PluginManager.prototype.getPostProcessors = function() {
        var postProcessors = [];
        for (var i = 0; i < this.postProcessors.length; i++) {
            postProcessors.push(this.postProcessors[i].postProcessor);
        }
        return postProcessors;
    };
    /**
     *
     * @returns {Array}
     * @private
     */
    PluginManager.prototype.getVisitors = function() {
        return this.visitors;
    };
    
    PluginManager.prototype.visitor = function() {
        var self = this;
        return {
            first: function() {
                self.iterator = -1;
                return self.visitors[self.iterator];
            },
            get: function() {
                self.iterator += 1;
                return self.visitors[self.iterator];
            }
        };
    };
    /**
     *
     * @returns {Array}
     * @private
     */
    PluginManager.prototype.getFileManagers = function() {
        return this.fileManagers;
    };
    
    //
    module.exports = PluginManagerFactory;
    
    },{}],46:[function(require,module,exports){
    var PromiseConstructor,
        utils = require('./utils');
    
    module.exports = function(environment, ParseTree, ImportManager) {
        var render = function (input, options, callback) {
            if (typeof options === 'function') {
                callback = options;
                options = utils.copyOptions(this.options, {});
            }
            else {
                options = utils.copyOptions(this.options, options || {});
            }
    
            if (!callback) {
                if (!PromiseConstructor) {
                    PromiseConstructor = typeof Promise === 'undefined' ? require('promise') : Promise;
                }
                var self = this;
                return new PromiseConstructor(function (resolve, reject) {
                    render.call(self, input, options, function(err, output) {
                        if (err) {
                            reject(err);
                        } else {
                            resolve(output);
                        }
                    });
                });
            } else {
                this.parse(input, options, function(err, root, imports, options) {
                    if (err) { return callback(err); }
    
                    var result;
                    try {
                        var parseTree = new ParseTree(root, imports);
                        result = parseTree.toCSS(options);
                    }
                    catch (err) { return callback(err); }
    
                    callback(null, result);
                });
            }
        };
    
        return render;
    };
    
    },{"./utils":89,"promise":undefined}],47:[function(require,module,exports){
    module.exports = function (SourceMapOutput, environment) {
    
        var SourceMapBuilder = function (options) {
            this.options = options;
        };
    
        SourceMapBuilder.prototype.toCSS = function(rootNode, options, imports) {
            var sourceMapOutput = new SourceMapOutput(
                {
                    contentsIgnoredCharsMap: imports.contentsIgnoredChars,
                    rootNode: rootNode,
                    contentsMap: imports.contents,
                    sourceMapFilename: this.options.sourceMapFilename,
                    sourceMapURL: this.options.sourceMapURL,
                    outputFilename: this.options.sourceMapOutputFilename,
                    sourceMapBasepath: this.options.sourceMapBasepath,
                    sourceMapRootpath: this.options.sourceMapRootpath,
                    outputSourceFiles: this.options.outputSourceFiles,
                    sourceMapGenerator: this.options.sourceMapGenerator,
                    sourceMapFileInline: this.options.sourceMapFileInline
                });
    
            var css = sourceMapOutput.toCSS(options);
            this.sourceMap = sourceMapOutput.sourceMap;
            this.sourceMapURL = sourceMapOutput.sourceMapURL;
            if (this.options.sourceMapInputFilename) {
                this.sourceMapInputFilename = sourceMapOutput.normalizeFilename(this.options.sourceMapInputFilename);
            }
            if (this.options.sourceMapBasepath !== undefined && this.sourceMapURL !== undefined) {
                this.sourceMapURL = sourceMapOutput.removeBasepath(this.sourceMapURL);
            }
            return css + this.getCSSAppendage();
        };
    
        SourceMapBuilder.prototype.getCSSAppendage = function() {
    
            var sourceMapURL = this.sourceMapURL;
            if (this.options.sourceMapFileInline) {
                if (this.sourceMap === undefined) {
                    return '';
                }
                sourceMapURL = 'data:application/json;base64,' + environment.encodeBase64(this.sourceMap);
            }
    
            if (sourceMapURL) {
                return '/*# sourceMappingURL=' + sourceMapURL + ' */';
            }
            return '';
        };
    
        SourceMapBuilder.prototype.getExternalSourceMap = function() {
            return this.sourceMap;
        };
        SourceMapBuilder.prototype.setExternalSourceMap = function(sourceMap) {
            this.sourceMap = sourceMap;
        };
    
        SourceMapBuilder.prototype.isInline = function() {
            return this.options.sourceMapFileInline;
        };
        SourceMapBuilder.prototype.getSourceMapURL = function() {
            return this.sourceMapURL;
        };
        SourceMapBuilder.prototype.getOutputFilename = function() {
            return this.options.sourceMapOutputFilename;
        };
        SourceMapBuilder.prototype.getInputFilename = function() {
            return this.sourceMapInputFilename;
        };
    
        return SourceMapBuilder;
    };
    
    },{}],48:[function(require,module,exports){
    module.exports = function (environment) {
    
        var SourceMapOutput = function (options) {
            this._css = [];
            this._rootNode = options.rootNode;
            this._contentsMap = options.contentsMap;
            this._contentsIgnoredCharsMap = options.contentsIgnoredCharsMap;
            if (options.sourceMapFilename) {
                this._sourceMapFilename = options.sourceMapFilename.replace(/\\/g, '/');
            }
            this._outputFilename = options.outputFilename;
            this.sourceMapURL = options.sourceMapURL;
            if (options.sourceMapBasepath) {
                this._sourceMapBasepath = options.sourceMapBasepath.replace(/\\/g, '/');
            }
            if (options.sourceMapRootpath) {
                this._sourceMapRootpath = options.sourceMapRootpath.replace(/\\/g, '/');
                if (this._sourceMapRootpath.charAt(this._sourceMapRootpath.length - 1) !== '/') {
                    this._sourceMapRootpath += '/';
                }
            } else {
                this._sourceMapRootpath = '';
            }
            this._outputSourceFiles = options.outputSourceFiles;
            this._sourceMapGeneratorConstructor = environment.getSourceMapGenerator();
    
            this._lineNumber = 0;
            this._column = 0;
        };
    
        SourceMapOutput.prototype.removeBasepath = function(path) {
            if (this._sourceMapBasepath && path.indexOf(this._sourceMapBasepath) === 0) {
                path = path.substring(this._sourceMapBasepath.length);
                if (path.charAt(0) === '\\' || path.charAt(0) === '/') {
                    path = path.substring(1);
                }
            }
    
            return path;
        };
    
        SourceMapOutput.prototype.normalizeFilename = function(filename) {
            filename = filename.replace(/\\/g, '/');
            filename = this.removeBasepath(filename);
            return (this._sourceMapRootpath || '') + filename;
        };
    
        SourceMapOutput.prototype.add = function(chunk, fileInfo, index, mapLines) {
    
            // ignore adding empty strings
            if (!chunk) {
                return;
            }
    
            var lines,
                sourceLines,
                columns,
                sourceColumns,
                i;
    
            if (fileInfo && fileInfo.filename) {
                var inputSource = this._contentsMap[fileInfo.filename];
    
                // remove vars/banner added to the top of the file
                if (this._contentsIgnoredCharsMap[fileInfo.filename]) {
                    // adjust the index
                    index -= this._contentsIgnoredCharsMap[fileInfo.filename];
                    if (index < 0) { index = 0; }
                    // adjust the source
                    inputSource = inputSource.slice(this._contentsIgnoredCharsMap[fileInfo.filename]);
                }
                inputSource = inputSource.substring(0, index);
                sourceLines = inputSource.split('\n');
                sourceColumns = sourceLines[sourceLines.length - 1];
            }
    
            lines = chunk.split('\n');
            columns = lines[lines.length - 1];
    
            if (fileInfo && fileInfo.filename) {
                if (!mapLines) {
                    this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + 1, column: this._column},
                        original: { line: sourceLines.length, column: sourceColumns.length},
                        source: this.normalizeFilename(fileInfo.filename)});
                } else {
                    for (i = 0; i < lines.length; i++) {
                        this._sourceMapGenerator.addMapping({ generated: { line: this._lineNumber + i + 1, column: i === 0 ? this._column : 0},
                            original: { line: sourceLines.length + i, column: i === 0 ? sourceColumns.length : 0},
                            source: this.normalizeFilename(fileInfo.filename)});
                    }
                }
            }
    
            if (lines.length === 1) {
                this._column += columns.length;
            } else {
                this._lineNumber += lines.length - 1;
                this._column = columns.length;
            }
    
            this._css.push(chunk);
        };
    
        SourceMapOutput.prototype.isEmpty = function() {
            return this._css.length === 0;
        };
    
        SourceMapOutput.prototype.toCSS = function(context) {
            this._sourceMapGenerator = new this._sourceMapGeneratorConstructor({ file: this._outputFilename, sourceRoot: null });
    
            if (this._outputSourceFiles) {
                for (var filename in this._contentsMap) {
                    if (this._contentsMap.hasOwnProperty(filename)) {
                        var source = this._contentsMap[filename];
                        if (this._contentsIgnoredCharsMap[filename]) {
                            source = source.slice(this._contentsIgnoredCharsMap[filename]);
                        }
                        this._sourceMapGenerator.setSourceContent(this.normalizeFilename(filename), source);
                    }
                }
            }
    
            this._rootNode.genCSS(context, this);
    
            if (this._css.length > 0) {
                var sourceMapURL,
                    sourceMapContent = JSON.stringify(this._sourceMapGenerator.toJSON());
    
                if (this.sourceMapURL) {
                    sourceMapURL = this.sourceMapURL;
                } else if (this._sourceMapFilename) {
                    sourceMapURL = this._sourceMapFilename;
                }
                this.sourceMapURL = sourceMapURL;
    
                this.sourceMap = sourceMapContent;
            }
    
            return this._css.join('');
        };
    
        return SourceMapOutput;
    };
    
    },{}],49:[function(require,module,exports){
    var contexts = require('./contexts'),
        visitor = require('./visitors'),
        tree = require('./tree');
    
    module.exports = function(root, options) {
        options = options || {};
        var evaldRoot,
            variables = options.variables,
            evalEnv = new contexts.Eval(options);
    
        //
        // Allows setting variables with a hash, so:
        //
        //   `{ color: new tree.Color('#f01') }` will become:
        //
        //   new tree.Declaration('@color',
        //     new tree.Value([
        //       new tree.Expression([
        //         new tree.Color('#f01')
        //       ])
        //     ])
        //   )
        //
        if (typeof variables === 'object' && !Array.isArray(variables)) {
            variables = Object.keys(variables).map(function (k) {
                var value = variables[k];
    
                if (!(value instanceof tree.Value)) {
                    if (!(value instanceof tree.Expression)) {
                        value = new tree.Expression([value]);
                    }
                    value = new tree.Value([value]);
                }
                return new tree.Declaration('@' + k, value, false, null, 0);
            });
            evalEnv.frames = [new tree.Ruleset(null, variables)];
        }
    
        var visitors = [
                new visitor.JoinSelectorVisitor(),
                new visitor.MarkVisibleSelectorsVisitor(true),
                new visitor.ExtendVisitor(),
                new visitor.ToCSSVisitor({compress: Boolean(options.compress)})
            ], preEvalVisitors = [], v, visitorIterator;
    
        /**
         * first() / get() allows visitors to be added while visiting
         * 
         * @todo Add scoping for visitors just like functions for @plugin; right now they're global
         */
        if (options.pluginManager) {
            visitorIterator = options.pluginManager.visitor();
            for (var i = 0; i < 2; i++) {
                visitorIterator.first();
                while ((v = visitorIterator.get())) {
                    if (v.isPreEvalVisitor) {
                        if (i === 0 || preEvalVisitors.indexOf(v) === -1) {
                            preEvalVisitors.push(v);
                            v.run(root);
                        }
                    }
                    else {
                        if (i === 0 || visitors.indexOf(v) === -1) {
                            if (v.isPreVisitor) {
                                visitors.unshift(v);
                            }
                            else {
                                visitors.push(v);
                            }
                        }
                    }
                }
            }
        }
        
        evaldRoot = root.eval(evalEnv);
    
        for (var i = 0; i < visitors.length; i++) {
            visitors[i].run(evaldRoot);
        }
    
        // Run any remaining visitors added after eval pass
        if (options.pluginManager) {
            visitorIterator.first();
            while ((v = visitorIterator.get())) {
                if (visitors.indexOf(v) === -1 && preEvalVisitors.indexOf(v) === -1) {
                    v.run(evaldRoot);
                }
            }
        }
    
        return evaldRoot;
    };
    
    },{"./contexts":13,"./tree":67,"./visitors":93}],50:[function(require,module,exports){
    var Node = require('./node');
    
    var Anonymous = function (value, index, currentFileInfo, mapLines, rulesetLike, visibilityInfo) {
        this.value = value;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.mapLines = mapLines;
        this.rulesetLike = (typeof rulesetLike === 'undefined') ? false : rulesetLike;
        this.allowRoot = true;
        this.copyVisibilityInfo(visibilityInfo);
    };
    Anonymous.prototype = new Node();
    Anonymous.prototype.type = 'Anonymous';
    Anonymous.prototype.eval = function () {
        return new Anonymous(this.value, this._index, this._fileInfo, this.mapLines, this.rulesetLike, this.visibilityInfo());
    };
    Anonymous.prototype.compare = function (other) {
        return other.toCSS && this.toCSS() === other.toCSS() ? 0 : undefined;
    };
    Anonymous.prototype.isRulesetLike = function() {
        return this.rulesetLike;
    };
    Anonymous.prototype.genCSS = function (context, output) {
        this.nodeVisible = Boolean(this.value);
        if (this.nodeVisible) {
            output.add(this.value, this._fileInfo, this._index, this.mapLines);
        }
    };
    module.exports = Anonymous;
    
    },{"./node":76}],51:[function(require,module,exports){
    var Node = require('./node');
    
    var Assignment = function (key, val) {
        this.key = key;
        this.value = val;
    };
    
    Assignment.prototype = new Node();
    Assignment.prototype.type = 'Assignment';
    Assignment.prototype.accept = function (visitor) {
        this.value = visitor.visit(this.value);
    };
    Assignment.prototype.eval = function (context) {
        if (this.value.eval) {
            return new Assignment(this.key, this.value.eval(context));
        }
        return this;
    };
    Assignment.prototype.genCSS = function (context, output) {
        output.add(this.key + '=');
        if (this.value.genCSS) {
            this.value.genCSS(context, output);
        } else {
            output.add(this.value);
        }
    };
    module.exports = Assignment;
    
    },{"./node":76}],52:[function(require,module,exports){
    var Node = require('./node'),
        Selector = require('./selector'),
        Ruleset = require('./ruleset'),
        Anonymous = require('./anonymous');
    
    var AtRule = function (name, value, rules, index, currentFileInfo, debugInfo, isRooted, visibilityInfo) {
        var i;
    
        this.name  = name;
        this.value = (value instanceof Node) ? value : (value ? new Anonymous(value) : value);
        if (rules) {
            if (Array.isArray(rules)) {
                this.rules = rules;
            } else {
                this.rules = [rules];
                this.rules[0].selectors = (new Selector([], null, null, index, currentFileInfo)).createEmptySelectors();
            }
            for (i = 0; i < this.rules.length; i++) {
                this.rules[i].allowImports = true;
            }
            this.setParent(this.rules, this);
        }
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.debugInfo = debugInfo;
        this.isRooted = isRooted || false;
        this.copyVisibilityInfo(visibilityInfo);
        this.allowRoot = true;
    };
    
    AtRule.prototype = new Node();
    AtRule.prototype.type = 'AtRule';
    AtRule.prototype.accept = function (visitor) {
        var value = this.value, rules = this.rules;
        if (rules) {
            this.rules = visitor.visitArray(rules);
        }
        if (value) {
            this.value = visitor.visit(value);
        }
    };
    AtRule.prototype.isRulesetLike = function() {
        return this.rules || !this.isCharset();
    };
    AtRule.prototype.isCharset = function() {
        return '@charset' === this.name;
    };
    AtRule.prototype.genCSS = function (context, output) {
        var value = this.value, rules = this.rules;
        output.add(this.name, this.fileInfo(), this.getIndex());
        if (value) {
            output.add(' ');
            value.genCSS(context, output);
        }
        if (rules) {
            this.outputRuleset(context, output, rules);
        } else {
            output.add(';');
        }
    };
    AtRule.prototype.eval = function (context) {
        var mediaPathBackup, mediaBlocksBackup, value = this.value, rules = this.rules;
    
        // media stored inside other atrule should not bubble over it
        // backpup media bubbling information
        mediaPathBackup = context.mediaPath;
        mediaBlocksBackup = context.mediaBlocks;
        // deleted media bubbling information
        context.mediaPath = [];
        context.mediaBlocks = [];
    
        if (value) {
            value = value.eval(context);
        }
        if (rules) {
            // assuming that there is only one rule at this point - that is how parser constructs the rule
            rules = [rules[0].eval(context)];
            rules[0].root = true;
        }
        // restore media bubbling information
        context.mediaPath = mediaPathBackup;
        context.mediaBlocks = mediaBlocksBackup;
    
        return new AtRule(this.name, value, rules,
            this.getIndex(), this.fileInfo(), this.debugInfo, this.isRooted, this.visibilityInfo());
    };
    AtRule.prototype.variable = function (name) {
        if (this.rules) {
            // assuming that there is only one rule at this point - that is how parser constructs the rule
            return Ruleset.prototype.variable.call(this.rules[0], name);
        }
    };
    AtRule.prototype.find = function () {
        if (this.rules) {
            // assuming that there is only one rule at this point - that is how parser constructs the rule
            return Ruleset.prototype.find.apply(this.rules[0], arguments);
        }
    };
    AtRule.prototype.rulesets = function () {
        if (this.rules) {
            // assuming that there is only one rule at this point - that is how parser constructs the rule
            return Ruleset.prototype.rulesets.apply(this.rules[0]);
        }
    };
    AtRule.prototype.outputRuleset = function (context, output, rules) {
        var ruleCnt = rules.length, i;
        context.tabLevel = (context.tabLevel | 0) + 1;
    
        // Compressed
        if (context.compress) {
            output.add('{');
            for (i = 0; i < ruleCnt; i++) {
                rules[i].genCSS(context, output);
            }
            output.add('}');
            context.tabLevel--;
            return;
        }
    
        // Non-compressed
        var tabSetStr = '\n' + Array(context.tabLevel).join('  '), tabRuleStr = tabSetStr + '  ';
        if (!ruleCnt) {
            output.add(' {' + tabSetStr + '}');
        } else {
            output.add(' {' + tabRuleStr);
            rules[0].genCSS(context, output);
            for (i = 1; i < ruleCnt; i++) {
                output.add(tabRuleStr);
                rules[i].genCSS(context, output);
            }
            output.add(tabSetStr + '}');
        }
    
        context.tabLevel--;
    };
    module.exports = AtRule;
    
    },{"./anonymous":50,"./node":76,"./ruleset":81,"./selector":82}],53:[function(require,module,exports){
    var Node = require('./node');
    
    var Attribute = function (key, op, value) {
        this.key = key;
        this.op = op;
        this.value = value;
    };
    Attribute.prototype = new Node();
    Attribute.prototype.type = 'Attribute';
    Attribute.prototype.eval = function (context) {
        return new Attribute(this.key.eval ? this.key.eval(context) : this.key,
            this.op, (this.value && this.value.eval) ? this.value.eval(context) : this.value);
    };
    Attribute.prototype.genCSS = function (context, output) {
        output.add(this.toCSS(context));
    };
    Attribute.prototype.toCSS = function (context) {
        var value = this.key.toCSS ? this.key.toCSS(context) : this.key;
    
        if (this.op) {
            value += this.op;
            value += (this.value.toCSS ? this.value.toCSS(context) : this.value);
        }
    
        return '[' + value + ']';
    };
    module.exports = Attribute;
    
    },{"./node":76}],54:[function(require,module,exports){
    var Node = require('./node'),
        Anonymous = require('./anonymous'),
        FunctionCaller = require('../functions/function-caller');
    //
    // A function call node.
    //
    var Call = function (name, args, index, currentFileInfo) {
        this.name = name;
        this.args = args;
        this.calc = name === 'calc';
        this._index = index;
        this._fileInfo = currentFileInfo;
    };
    Call.prototype = new Node();
    Call.prototype.type = 'Call';
    Call.prototype.accept = function (visitor) {
        if (this.args) {
            this.args = visitor.visitArray(this.args);
        }
    };
    //
    // When evaluating a function call,
    // we either find the function in the functionRegistry,
    // in which case we call it, passing the  evaluated arguments,
    // if this returns null or we cannot find the function, we
    // simply print it out as it appeared originally [2].
    //
    // The reason why we evaluate the arguments, is in the case where
    // we try to pass a variable to a function, like: `saturate(@color)`.
    // The function should receive the value, not the variable.
    //
    Call.prototype.eval = function (context) {
        /**
         * Turn off math for calc(), and switch back on for evaluating nested functions
         */
        var currentMathContext = context.mathOn;
        context.mathOn = !this.calc;
        if (this.calc || context.inCalc) {
            context.enterCalc();
        }
        var args = this.args.map(function (a) { return a.eval(context); });
        if (this.calc || context.inCalc) {
            context.exitCalc();
        }
        context.mathOn = currentMathContext;
    
        var result, funcCaller = new FunctionCaller(this.name, context, this.getIndex(), this.fileInfo());
        
        if (funcCaller.isValid()) {
            try {
                result = funcCaller.call(args);
            } catch (e) {
                throw { 
                    type: e.type || 'Runtime',
                    message: 'error evaluating function `' + this.name + '`' +
                             (e.message ? ': ' + e.message : ''),
                    index: this.getIndex(), 
                    filename: this.fileInfo().filename,
                    line: e.lineNumber,
                    column: e.columnNumber
                };
            }
    
            if (result !== null && result !== undefined) {
                // Results that that are not nodes are cast as Anonymous nodes
                // Falsy values or booleans are returned as empty nodes
                if (!(result instanceof Node)) {
                    if (!result || result === true) {
                        result = new Anonymous(null); 
                    }
                    else {
                        result = new Anonymous(result.toString()); 
                    }
                    
                }
                result._index = this._index;
                result._fileInfo = this._fileInfo;
                return result;
            }
    
        }
    
        return new Call(this.name, args, this.getIndex(), this.fileInfo());
    };
    Call.prototype.genCSS = function (context, output) {
        output.add(this.name + '(', this.fileInfo(), this.getIndex());
    
        for (var i = 0; i < this.args.length; i++) {
            this.args[i].genCSS(context, output);
            if (i + 1 < this.args.length) {
                output.add(', ');
            }
        }
    
        output.add(')');
    };
    module.exports = Call;
    
    },{"../functions/function-caller":26,"./anonymous":50,"./node":76}],55:[function(require,module,exports){
    var Node = require('./node'),
        colors = require('../data/colors');
    
    //
    // RGB Colors - #ff0014, #eee
    //
    var Color = function (rgb, a, originalForm) {
        var self = this;
        //
        // The end goal here, is to parse the arguments
        // into an integer triplet, such as `128, 255, 0`
        //
        // This facilitates operations and conversions.
        //
        if (Array.isArray(rgb)) {
            this.rgb = rgb;
        } else if (rgb.length >= 6) {
            this.rgb = [];
            rgb.match(/.{2}/g).map(function (c, i) {
                if (i < 3) {
                    self.rgb.push(parseInt(c, 16));
                } else {
                    self.alpha = (parseInt(c, 16)) / 255;
                }
            });
        } else {
            this.rgb = [];
            rgb.split('').map(function (c, i) {
                if (i < 3) {
                    self.rgb.push(parseInt(c + c, 16));
                } else {
                    self.alpha = (parseInt(c + c, 16)) / 255;
                }
            });
        }
        this.alpha = this.alpha || (typeof a === 'number' ? a : 1);
        if (typeof originalForm !== 'undefined') {
            this.value = originalForm;
        }
    };
    
    Color.prototype = new Node();
    Color.prototype.type = 'Color';
    
    function clamp(v, max) {
        return Math.min(Math.max(v, 0), max);
    }
    
    function toHex(v) {
        return '#' + v.map(function (c) {
            c = clamp(Math.round(c), 255);
            return (c < 16 ? '0' : '') + c.toString(16);
        }).join('');
    }
    
    Color.prototype.luma = function () {
        var r = this.rgb[0] / 255,
            g = this.rgb[1] / 255,
            b = this.rgb[2] / 255;
    
        r = (r <= 0.03928) ? r / 12.92 : Math.pow(((r + 0.055) / 1.055), 2.4);
        g = (g <= 0.03928) ? g / 12.92 : Math.pow(((g + 0.055) / 1.055), 2.4);
        b = (b <= 0.03928) ? b / 12.92 : Math.pow(((b + 0.055) / 1.055), 2.4);
    
        return 0.2126 * r + 0.7152 * g + 0.0722 * b;
    };
    Color.prototype.genCSS = function (context, output) {
        output.add(this.toCSS(context));
    };
    Color.prototype.toCSS = function (context, doNotCompress) {
        var compress = context && context.compress && !doNotCompress, color, alpha,
            colorFunction, args = [];
    
        // `value` is set if this color was originally
        // converted from a named color string so we need
        // to respect this and try to output named color too.
        alpha = this.fround(context, this.alpha);
    
        if (this.value) {
            if (this.value.indexOf('rgb') === 0) {
                if (alpha < 1) {
                    colorFunction = 'rgba';
                }
            } else if (this.value.indexOf('hsl') === 0) {
                if (alpha < 1) {
                    colorFunction = 'hsla';
                } else {
                    colorFunction = 'hsl';
                }
            } else {
                return this.value;
            }
        } else {
            if (alpha < 1) {
                colorFunction = 'rgba';
            }
        }
    
        switch (colorFunction) {
            case 'rgba':
                args = this.rgb.map(function (c) {
                    return clamp(Math.round(c), 255);
                }).concat(clamp(alpha, 1));
                break;
            case 'hsla':
                args.push(clamp(alpha, 1));
            case 'hsl':
                color = this.toHSL();
                args = [
                    this.fround(context, color.h),
                    this.fround(context, color.s * 100) + '%',
                    this.fround(context, color.l * 100) + '%'
                ].concat(args);
        }
    
        if (colorFunction) {
            // Values are capped between `0` and `255`, rounded and zero-padded.
            return colorFunction + '(' + args.join(',' + (compress ? '' : ' ')) + ')';
        }
    
        color = this.toRGB();
    
        if (compress) {
            var splitcolor = color.split('');
    
            // Convert color to short format
            if (splitcolor[1] === splitcolor[2] && splitcolor[3] === splitcolor[4] && splitcolor[5] === splitcolor[6]) {
                color = '#' + splitcolor[1] + splitcolor[3] + splitcolor[5];
            }
        }
    
        return color;
    };
    
    //
    // Operations have to be done per-channel, if not,
    // channels will spill onto each other. Once we have
    // our result, in the form of an integer triplet,
    // we create a new Color node to hold the result.
    //
    Color.prototype.operate = function (context, op, other) {
        var rgb = new Array(3);
        var alpha = this.alpha * (1 - other.alpha) + other.alpha;
        for (var c = 0; c < 3; c++) {
            rgb[c] = this._operate(context, op, this.rgb[c], other.rgb[c]);
        }
        return new Color(rgb, alpha);
    };
    Color.prototype.toRGB = function () {
        return toHex(this.rgb);
    };
    Color.prototype.toHSL = function () {
        var r = this.rgb[0] / 255,
            g = this.rgb[1] / 255,
            b = this.rgb[2] / 255,
            a = this.alpha;
    
        var max = Math.max(r, g, b), min = Math.min(r, g, b);
        var h, s, l = (max + min) / 2, d = max - min;
    
        if (max === min) {
            h = s = 0;
        } else {
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
    
            switch (max) {
                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
                case g: h = (b - r) / d + 2;               break;
                case b: h = (r - g) / d + 4;               break;
            }
            h /= 6;
        }
        return { h: h * 360, s: s, l: l, a: a };
    };
    // Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
    Color.prototype.toHSV = function () {
        var r = this.rgb[0] / 255,
            g = this.rgb[1] / 255,
            b = this.rgb[2] / 255,
            a = this.alpha;
    
        var max = Math.max(r, g, b), min = Math.min(r, g, b);
        var h, s, v = max;
    
        var d = max - min;
        if (max === 0) {
            s = 0;
        } else {
            s = d / max;
        }
    
        if (max === min) {
            h = 0;
        } else {
            switch (max) {
                case r: h = (g - b) / d + (g < b ? 6 : 0); break;
                case g: h = (b - r) / d + 2; break;
                case b: h = (r - g) / d + 4; break;
            }
            h /= 6;
        }
        return { h: h * 360, s: s, v: v, a: a };
    };
    Color.prototype.toARGB = function () {
        return toHex([this.alpha * 255].concat(this.rgb));
    };
    Color.prototype.compare = function (x) {
        return (x.rgb &&
            x.rgb[0] === this.rgb[0] &&
            x.rgb[1] === this.rgb[1] &&
            x.rgb[2] === this.rgb[2] &&
            x.alpha  === this.alpha) ? 0 : undefined;
    };
    
    Color.fromKeyword = function(keyword) {
        var c, key = keyword.toLowerCase();
        if (colors.hasOwnProperty(key)) {
            c = new Color(colors[key].slice(1));
        }
        else if (key === 'transparent') {
            c = new Color([0, 0, 0], 0);
        }
    
        if (c) {
            c.value = keyword;
            return c;
        }
    };
    module.exports = Color;
    
    },{"../data/colors":14,"./node":76}],56:[function(require,module,exports){
    var Node = require('./node');
    
    var Combinator = function (value) {
        if (value === ' ') {
            this.value = ' ';
            this.emptyOrWhitespace = true;
        } else {
            this.value = value ? value.trim() : '';
            this.emptyOrWhitespace = this.value === '';
        }
    };
    Combinator.prototype = new Node();
    Combinator.prototype.type = 'Combinator';
    var _noSpaceCombinators = {
        '': true,
        ' ': true,
        '|': true
    };
    Combinator.prototype.genCSS = function (context, output) {
        var spaceOrEmpty = (context.compress || _noSpaceCombinators[this.value]) ? '' : ' ';
        output.add(spaceOrEmpty + this.value + spaceOrEmpty);
    };
    module.exports = Combinator;
    
    },{"./node":76}],57:[function(require,module,exports){
    var Node = require('./node'),
        getDebugInfo = require('./debug-info');
    
    var Comment = function (value, isLineComment, index, currentFileInfo) {
        this.value = value;
        this.isLineComment = isLineComment;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.allowRoot = true;
    };
    Comment.prototype = new Node();
    Comment.prototype.type = 'Comment';
    Comment.prototype.genCSS = function (context, output) {
        if (this.debugInfo) {
            output.add(getDebugInfo(context, this), this.fileInfo(), this.getIndex());
        }
        output.add(this.value);
    };
    Comment.prototype.isSilent = function(context) {
        var isCompressed = context.compress && this.value[2] !== '!';
        return this.isLineComment || isCompressed;
    };
    module.exports = Comment;
    
    },{"./debug-info":59,"./node":76}],58:[function(require,module,exports){
    var Node = require('./node');
    
    var Condition = function (op, l, r, i, negate) {
        this.op = op.trim();
        this.lvalue = l;
        this.rvalue = r;
        this._index = i;
        this.negate = negate;
    };
    Condition.prototype = new Node();
    Condition.prototype.type = 'Condition';
    Condition.prototype.accept = function (visitor) {
        this.lvalue = visitor.visit(this.lvalue);
        this.rvalue = visitor.visit(this.rvalue);
    };
    Condition.prototype.eval = function (context) {
        var result = (function (op, a, b) {
            switch (op) {
                case 'and': return a && b;
                case 'or':  return a || b;
                default:
                    switch (Node.compare(a, b)) {
                        case -1:
                            return op === '<' || op === '=<' || op === '<=';
                        case 0:
                            return op === '=' || op === '>=' || op === '=<' || op === '<=';
                        case 1:
                            return op === '>' || op === '>=';
                        default:
                            return false;
                    }
            }
        })(this.op, this.lvalue.eval(context), this.rvalue.eval(context));
    
        return this.negate ? !result : result;
    };
    module.exports = Condition;
    
    },{"./node":76}],59:[function(require,module,exports){
    var debugInfo = function(context, ctx, lineSeparator) {
        var result = '';
        if (context.dumpLineNumbers && !context.compress) {
            switch (context.dumpLineNumbers) {
                case 'comments':
                    result = debugInfo.asComment(ctx);
                    break;
                case 'mediaquery':
                    result = debugInfo.asMediaQuery(ctx);
                    break;
                case 'all':
                    result = debugInfo.asComment(ctx) + (lineSeparator || '') + debugInfo.asMediaQuery(ctx);
                    break;
            }
        }
        return result;
    };
    
    debugInfo.asComment = function(ctx) {
        return '/* line ' + ctx.debugInfo.lineNumber + ', ' + ctx.debugInfo.fileName + ' */\n';
    };
    
    debugInfo.asMediaQuery = function(ctx) {
        var filenameWithProtocol = ctx.debugInfo.fileName;
        if (!/^[a-z]+:\/\//i.test(filenameWithProtocol)) {
            filenameWithProtocol = 'file://' + filenameWithProtocol;
        }
        return '@media -sass-debug-info{filename{font-family:' +
            filenameWithProtocol.replace(/([.:\/\\])/g, function (a) {
                if (a == '\\') {
                    a = '\/';
                }
                return '\\' + a;
            }) +
            '}line{font-family:\\00003' + ctx.debugInfo.lineNumber + '}}\n';
    };
    
    module.exports = debugInfo;
    
    },{}],60:[function(require,module,exports){
    var Node = require('./node'),
        Value = require('./value'),
        Keyword = require('./keyword'),
        Anonymous = require('./anonymous'),
        MATH = require('../constants').Math;
    
    var Declaration = function (name, value, important, merge, index, currentFileInfo, inline, variable) {
        this.name = name;
        this.value = (value instanceof Node) ? value : new Value([value ? new Anonymous(value) : null]);
        this.important = important ? ' ' + important.trim() : '';
        this.merge = merge;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.inline = inline || false;
        this.variable = (variable !== undefined) ? variable
            : (name.charAt && (name.charAt(0) === '@'));
        this.allowRoot = true;
        this.setParent(this.value, this);
    };
    
    function evalName(context, name) {
        var value = '', i, n = name.length,
            output = {add: function (s) {value += s;}};
        for (i = 0; i < n; i++) {
            name[i].eval(context).genCSS(context, output);
        }
        return value;
    }
    
    Declaration.prototype = new Node();
    Declaration.prototype.type = 'Declaration';
    Declaration.prototype.genCSS = function (context, output) {
        output.add(this.name + (context.compress ? ':' : ': '), this.fileInfo(), this.getIndex());
        try {
            this.value.genCSS(context, output);
        }
        catch (e) {
            e.index = this._index;
            e.filename = this._fileInfo.filename;
            throw e;
        }
        output.add(this.important + ((this.inline || (context.lastRule && context.compress)) ? '' : ';'), this._fileInfo, this._index);
    };
    Declaration.prototype.eval = function (context) {
        var mathBypass = false, prevMath, name = this.name, evaldValue, variable = this.variable;
        if (typeof name !== 'string') {
            // expand 'primitive' name directly to get
            // things faster (~10% for benchmark.less):
            name = (name.length === 1) && (name[0] instanceof Keyword) ?
                    name[0].value : evalName(context, name);
            variable = false; // never treat expanded interpolation as new variable name
        }
    
        // @todo remove when parens-division is default
        if (name === 'font' && context.math === MATH.ALWAYS) {
            mathBypass = true;
            prevMath = context.math;
            context.math = MATH.PARENS_DIVISION;
        }
        try {
            context.importantScope.push({});
            evaldValue = this.value.eval(context);
    
            if (!this.variable && evaldValue.type === 'DetachedRuleset') {
                throw { message: 'Rulesets cannot be evaluated on a property.',
                    index: this.getIndex(), filename: this.fileInfo().filename };
            }
            var important = this.important,
                importantResult = context.importantScope.pop();
            if (!important && importantResult.important) {
                important = importantResult.important;
            }
    
            return new Declaration(name,
                              evaldValue,
                              important,
                              this.merge,
                              this.getIndex(), this.fileInfo(), this.inline,
                                  variable);
        }
        catch (e) {
            if (typeof e.index !== 'number') {
                e.index = this.getIndex();
                e.filename = this.fileInfo().filename;
            }
            throw e;
        }
        finally {
            if (mathBypass) {
                context.math = prevMath;
            }
        }
    };
    Declaration.prototype.makeImportant = function () {
        return new Declaration(this.name,
                              this.value,
                              '!important',
                              this.merge,
                              this.getIndex(), this.fileInfo(), this.inline);
    };
    
    module.exports = Declaration;
    },{"../constants":12,"./anonymous":50,"./keyword":70,"./node":76,"./value":86}],61:[function(require,module,exports){
    var Node = require('./node'),
        contexts = require('../contexts'),
        utils = require('../utils');
    
    var DetachedRuleset = function (ruleset, frames) {
        this.ruleset = ruleset;
        this.frames = frames;
        this.setParent(this.ruleset, this);
    };
    DetachedRuleset.prototype = new Node();
    DetachedRuleset.prototype.type = 'DetachedRuleset';
    DetachedRuleset.prototype.evalFirst = true;
    DetachedRuleset.prototype.accept = function (visitor) {
        this.ruleset = visitor.visit(this.ruleset);
    };
    DetachedRuleset.prototype.eval = function (context) {
        var frames = this.frames || utils.copyArray(context.frames);
        return new DetachedRuleset(this.ruleset, frames);
    };
    DetachedRuleset.prototype.callEval = function (context) {
        return this.ruleset.eval(this.frames ? new contexts.Eval(context, this.frames.concat(context.frames)) : context);
    };
    module.exports = DetachedRuleset;
    
    },{"../contexts":13,"../utils":89,"./node":76}],62:[function(require,module,exports){
    var Node = require('./node'),
        unitConversions = require('../data/unit-conversions'),
        Unit = require('./unit'),
        Color = require('./color');
    
    //
    // A number with a unit
    //
    var Dimension = function (value, unit) {
        this.value = parseFloat(value);
        if (isNaN(this.value)) {
            throw new Error('Dimension is not a number.');
        }
        this.unit = (unit && unit instanceof Unit) ? unit :
          new Unit(unit ? [unit] : undefined);
        this.setParent(this.unit, this);
    };
    
    Dimension.prototype = new Node();
    Dimension.prototype.type = 'Dimension';
    Dimension.prototype.accept = function (visitor) {
        this.unit = visitor.visit(this.unit);
    };
    Dimension.prototype.eval = function (context) {
        return this;
    };
    Dimension.prototype.toColor = function () {
        return new Color([this.value, this.value, this.value]);
    };
    Dimension.prototype.genCSS = function (context, output) {
        if ((context && context.strictUnits) && !this.unit.isSingular()) {
            throw new Error('Multiple units in dimension. Correct the units or use the unit function. Bad unit: ' + this.unit.toString());
        }
    
        var value = this.fround(context, this.value),
            strValue = String(value);
    
        if (value !== 0 && value < 0.000001 && value > -0.000001) {
            // would be output 1e-6 etc.
            strValue = value.toFixed(20).replace(/0+$/, '');
        }
    
        if (context && context.compress) {
            // Zero values doesn't need a unit
            if (value === 0 && this.unit.isLength()) {
                output.add(strValue);
                return;
            }
    
            // Float values doesn't need a leading zero
            if (value > 0 && value < 1) {
                strValue = (strValue).substr(1);
            }
        }
    
        output.add(strValue);
        this.unit.genCSS(context, output);
    };
    
    // In an operation between two Dimensions,
    // we default to the first Dimension's unit,
    // so `1px + 2` will yield `3px`.
    Dimension.prototype.operate = function (context, op, other) {
        /* jshint noempty:false */
        var value = this._operate(context, op, this.value, other.value),
            unit = this.unit.clone();
    
        if (op === '+' || op === '-') {
            if (unit.numerator.length === 0 && unit.denominator.length === 0) {
                unit = other.unit.clone();
                if (this.unit.backupUnit) {
                    unit.backupUnit = this.unit.backupUnit;
                }
            } else if (other.unit.numerator.length === 0 && unit.denominator.length === 0) {
                // do nothing
            } else {
                other = other.convertTo(this.unit.usedUnits());
    
                if (context.strictUnits && other.unit.toString() !== unit.toString()) {
                    throw new Error('Incompatible units. Change the units or use the unit function. Bad units: \'' + unit.toString() +
                        '\' and \'' + other.unit.toString() + '\'.');
                }
    
                value = this._operate(context, op, this.value, other.value);
            }
        } else if (op === '*') {
            unit.numerator = unit.numerator.concat(other.unit.numerator).sort();
            unit.denominator = unit.denominator.concat(other.unit.denominator).sort();
            unit.cancel();
        } else if (op === '/') {
            unit.numerator = unit.numerator.concat(other.unit.denominator).sort();
            unit.denominator = unit.denominator.concat(other.unit.numerator).sort();
            unit.cancel();
        }
        return new Dimension(value, unit);
    };
    Dimension.prototype.compare = function (other) {
        var a, b;
    
        if (!(other instanceof Dimension)) {
            return undefined;
        }
    
        if (this.unit.isEmpty() || other.unit.isEmpty()) {
            a = this;
            b = other;
        } else {
            a = this.unify();
            b = other.unify();
            if (a.unit.compare(b.unit) !== 0) {
                return undefined;
            }
        }
    
        return Node.numericCompare(a.value, b.value);
    };
    Dimension.prototype.unify = function () {
        return this.convertTo({ length: 'px', duration: 's', angle: 'rad' });
    };
    Dimension.prototype.convertTo = function (conversions) {
        var value = this.value, unit = this.unit.clone(),
            i, groupName, group, targetUnit, derivedConversions = {}, applyUnit;
    
        if (typeof conversions === 'string') {
            for (i in unitConversions) {
                if (unitConversions[i].hasOwnProperty(conversions)) {
                    derivedConversions = {};
                    derivedConversions[i] = conversions;
                }
            }
            conversions = derivedConversions;
        }
        applyUnit = function (atomicUnit, denominator) {
            /* jshint loopfunc:true */
            if (group.hasOwnProperty(atomicUnit)) {
                if (denominator) {
                    value = value / (group[atomicUnit] / group[targetUnit]);
                } else {
                    value = value * (group[atomicUnit] / group[targetUnit]);
                }
    
                return targetUnit;
            }
    
            return atomicUnit;
        };
    
        for (groupName in conversions) {
            if (conversions.hasOwnProperty(groupName)) {
                targetUnit = conversions[groupName];
                group = unitConversions[groupName];
    
                unit.map(applyUnit);
            }
        }
    
        unit.cancel();
    
        return new Dimension(value, unit);
    };
    module.exports = Dimension;
    
    },{"../data/unit-conversions":16,"./color":55,"./node":76,"./unit":84}],63:[function(require,module,exports){
    var Node = require('./node'),
        Paren = require('./paren'),
        Combinator = require('./combinator');
    
    var Element = function (combinator, value, isVariable, index, currentFileInfo, visibilityInfo) {
        this.combinator = combinator instanceof Combinator ?
                          combinator : new Combinator(combinator);
    
        if (typeof value === 'string') {
            this.value = value.trim();
        } else if (value) {
            this.value = value;
        } else {
            this.value = '';
        }
        this.isVariable = isVariable;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.copyVisibilityInfo(visibilityInfo);
        this.setParent(this.combinator, this);
    };
    Element.prototype = new Node();
    Element.prototype.type = 'Element';
    Element.prototype.accept = function (visitor) {
        var value = this.value;
        this.combinator = visitor.visit(this.combinator);
        if (typeof value === 'object') {
            this.value = visitor.visit(value);
        }
    };
    Element.prototype.eval = function (context) {
        return new Element(this.combinator,
                                 this.value.eval ? this.value.eval(context) : this.value,
                                 this.isVariable,
                                 this.getIndex(),
                                 this.fileInfo(), this.visibilityInfo());
    };
    Element.prototype.clone = function () {
        return new Element(this.combinator,
            this.value,
            this.isVariable,
            this.getIndex(),
            this.fileInfo(), this.visibilityInfo());
    };
    Element.prototype.genCSS = function (context, output) {
        output.add(this.toCSS(context), this.fileInfo(), this.getIndex());
    };
    Element.prototype.toCSS = function (context) {
        context = context || {};
        var value = this.value, firstSelector = context.firstSelector;
        if (value instanceof Paren) {
            // selector in parens should not be affected by outer selector
            // flags (breaks only interpolated selectors - see #1973)
            context.firstSelector = true;
        }
        value = value.toCSS ? value.toCSS(context) : value;
        context.firstSelector = firstSelector;
        if (value === '' && this.combinator.value.charAt(0) === '&') {
            return '';
        } else {
            return this.combinator.toCSS(context) + value;
        }
    };
    module.exports = Element;
    
    },{"./combinator":56,"./node":76,"./paren":78}],64:[function(require,module,exports){
    var Node = require('./node'),
        Paren = require('./paren'),
        Comment = require('./comment'),
        Dimension = require('./dimension'),
        MATH = require('../constants').Math;
    
    var Expression = function (value, noSpacing) {
        this.value = value;
        this.noSpacing = noSpacing;
        if (!value) {
            throw new Error('Expression requires an array parameter');
        }
    };
    Expression.prototype = new Node();
    Expression.prototype.type = 'Expression';
    Expression.prototype.accept = function (visitor) {
        this.value = visitor.visitArray(this.value);
    };
    Expression.prototype.eval = function (context) {
        var returnValue,
            mathOn = context.isMathOn(),
            inParenthesis = this.parens && 
                (context.math !== MATH.STRICT_LEGACY || !this.parensInOp),
            doubleParen = false;
        if (inParenthesis) {
            context.inParenthesis();
        }
        if (this.value.length > 1) {
            returnValue = new Expression(this.value.map(function (e) {
                if (!e.eval) {
                    return e;
                }
                return e.eval(context);
            }), this.noSpacing);
        } else if (this.value.length === 1) {
            if (this.value[0].parens && !this.value[0].parensInOp && !context.inCalc) {
                doubleParen = true;
            }
            returnValue = this.value[0].eval(context);
        } else {
            returnValue = this;
        }
        if (inParenthesis) {
            context.outOfParenthesis();
        }
        if (this.parens && this.parensInOp && !mathOn && !doubleParen 
            && (!(returnValue instanceof Dimension))) {
            returnValue = new Paren(returnValue);
        }
        return returnValue;
    };
    Expression.prototype.genCSS = function (context, output) {
        for (var i = 0; i < this.value.length; i++) {
            this.value[i].genCSS(context, output);
            if (!this.noSpacing && i + 1 < this.value.length) {
                output.add(' ');
            }
        }
    };
    Expression.prototype.throwAwayComments = function () {
        this.value = this.value.filter(function(v) {
            return !(v instanceof Comment);
        });
    };
    module.exports = Expression;
    
    },{"../constants":12,"./comment":57,"./dimension":62,"./node":76,"./paren":78}],65:[function(require,module,exports){
    var Node = require('./node'),
        Selector = require('./selector');
    
    var Extend = function Extend(selector, option, index, currentFileInfo, visibilityInfo) {
        this.selector = selector;
        this.option = option;
        this.object_id = Extend.next_id++;
        this.parent_ids = [this.object_id];
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.copyVisibilityInfo(visibilityInfo);
        this.allowRoot = true;
    
        switch (option) {
            case 'all':
                this.allowBefore = true;
                this.allowAfter = true;
                break;
            default:
                this.allowBefore = false;
                this.allowAfter = false;
                break;
        }
        this.setParent(this.selector, this);
    };
    Extend.next_id = 0;
    
    Extend.prototype = new Node();
    Extend.prototype.type = 'Extend';
    Extend.prototype.accept = function (visitor) {
        this.selector = visitor.visit(this.selector);
    };
    Extend.prototype.eval = function (context) {
        return new Extend(this.selector.eval(context), this.option, this.getIndex(), this.fileInfo(), this.visibilityInfo());
    };
    Extend.prototype.clone = function (context) {
        return new Extend(this.selector, this.option, this.getIndex(), this.fileInfo(), this.visibilityInfo());
    };
    // it concatenates (joins) all selectors in selector array
    Extend.prototype.findSelfSelectors = function (selectors) {
        var selfElements = [],
            i,
            selectorElements;
    
        for (i = 0; i < selectors.length; i++) {
            selectorElements = selectors[i].elements;
            // duplicate the logic in genCSS function inside the selector node.
            // future TODO - move both logics into the selector joiner visitor
            if (i > 0 && selectorElements.length && selectorElements[0].combinator.value === '') {
                selectorElements[0].combinator.value = ' ';
            }
            selfElements = selfElements.concat(selectors[i].elements);
        }
    
        this.selfSelectors = [new Selector(selfElements)];
        this.selfSelectors[0].copyVisibilityInfo(this.visibilityInfo());
    };
    module.exports = Extend;
    
    },{"./node":76,"./selector":82}],66:[function(require,module,exports){
    var Node = require('./node'),
        Media = require('./media'),
        URL = require('./url'),
        Quoted = require('./quoted'),
        Ruleset = require('./ruleset'),
        Anonymous = require('./anonymous'),
        utils = require('../utils'),
        LessError = require('../less-error');
    
    //
    // CSS @import node
    //
    // The general strategy here is that we don't want to wait
    // for the parsing to be completed, before we start importing
    // the file. That's because in the context of a browser,
    // most of the time will be spent waiting for the server to respond.
    //
    // On creation, we push the import path to our import queue, though
    // `import,push`, we also pass it a callback, which it'll call once
    // the file has been fetched, and parsed.
    //
    var Import = function (path, features, options, index, currentFileInfo, visibilityInfo) {
        this.options = options;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.path = path;
        this.features = features;
        this.allowRoot = true;
    
        if (this.options.less !== undefined || this.options.inline) {
            this.css = !this.options.less || this.options.inline;
        } else {
            var pathValue = this.getPath();
            if (pathValue && /[#\.\&\?]css([\?;].*)?$/.test(pathValue)) {
                this.css = true;
            }
        }
        this.copyVisibilityInfo(visibilityInfo);
        this.setParent(this.features, this);
        this.setParent(this.path, this);
    };
    
    //
    // The actual import node doesn't return anything, when converted to CSS.
    // The reason is that it's used at the evaluation stage, so that the rules
    // it imports can be treated like any other rules.
    //
    // In `eval`, we make sure all Import nodes get evaluated, recursively, so
    // we end up with a flat structure, which can easily be imported in the parent
    // ruleset.
    //
    Import.prototype = new Node();
    Import.prototype.type = 'Import';
    Import.prototype.accept = function (visitor) {
        if (this.features) {
            this.features = visitor.visit(this.features);
        }
        this.path = visitor.visit(this.path);
        if (!this.options.isPlugin && !this.options.inline && this.root) {
            this.root = visitor.visit(this.root);
        }
    };
    Import.prototype.genCSS = function (context, output) {
        if (this.css && this.path._fileInfo.reference === undefined) {
            output.add('@import ', this._fileInfo, this._index);
            this.path.genCSS(context, output);
            if (this.features) {
                output.add(' ');
                this.features.genCSS(context, output);
            }
            output.add(';');
        }
    };
    Import.prototype.getPath = function () {
        return (this.path instanceof URL) ?
            this.path.value.value : this.path.value;
    };
    Import.prototype.isVariableImport = function () {
        var path = this.path;
        if (path instanceof URL) {
            path = path.value;
        }
        if (path instanceof Quoted) {
            return path.containsVariables();
        }
    
        return true;
    };
    Import.prototype.evalForImport = function (context) {
        var path = this.path;
    
        if (path instanceof URL) {
            path = path.value;
        }
    
        return new Import(path.eval(context), this.features, this.options, this._index, this._fileInfo, this.visibilityInfo());
    };
    Import.prototype.evalPath = function (context) {
        var path = this.path.eval(context);
        var fileInfo = this._fileInfo;
    
        if (!(path instanceof URL)) {
            // Add the rootpath if the URL requires a rewrite
            var pathValue = path.value;
            if (fileInfo &&
                pathValue &&
                context.pathRequiresRewrite(pathValue)) {
                path.value = context.rewritePath(pathValue, fileInfo.rootpath);
            } else {
                path.value = context.normalizePath(path.value);
            }
        }
    
        return path;
    };
    Import.prototype.eval = function (context) {
        var result = this.doEval(context);
        if (this.options.reference || this.blocksVisibility()) {
            if (result.length || result.length === 0) {
                result.forEach(function (node) {
                    node.addVisibilityBlock();
                }
                );
            } else {
                result.addVisibilityBlock();
            }
        }
        return result;
    };
    Import.prototype.doEval = function (context) {
        var ruleset, registry,
            features = this.features && this.features.eval(context);
    
        if (this.options.isPlugin) {
            if (this.root && this.root.eval) {
                try {
                    this.root.eval(context);
                }
                catch (e) {
                    e.message = 'Plugin error during evaluation';
                    throw new LessError(e, this.root.imports, this.root.filename);
                }
            }
            registry = context.frames[0] && context.frames[0].functionRegistry;
            if ( registry && this.root && this.root.functions ) {
                registry.addMultiple( this.root.functions );
            }
    
            return [];
        }
    
        if (this.skip) {
            if (typeof this.skip === 'function') {
                this.skip = this.skip();
            }
            if (this.skip) {
                return [];
            }
        }
        if (this.options.inline) {
            var contents = new Anonymous(this.root, 0,
                {
                    filename: this.importedFilename,
                    reference: this.path._fileInfo && this.path._fileInfo.reference
                }, true, true);
    
            return this.features ? new Media([contents], this.features.value) : [contents];
        } else if (this.css) {
            var newImport = new Import(this.evalPath(context), features, this.options, this._index);
            if (!newImport.css && this.error) {
                throw this.error;
            }
            return newImport;
        } else {
            ruleset = new Ruleset(null, utils.copyArray(this.root.rules));
            ruleset.evalImports(context);
    
            return this.features ? new Media(ruleset.rules, this.features.value) : ruleset.rules;
        }
    };
    module.exports = Import;
    
    },{"../less-error":38,"../utils":89,"./anonymous":50,"./media":71,"./node":76,"./quoted":80,"./ruleset":81,"./url":85}],67:[function(require,module,exports){
    var tree = Object.create(null);
    
    tree.Node = require('./node');
    tree.Color = require('./color');
    tree.AtRule = require('./atrule');
    tree.DetachedRuleset = require('./detached-ruleset');
    tree.Operation = require('./operation');
    tree.Dimension = require('./dimension');
    tree.Unit = require('./unit');
    tree.Keyword = require('./keyword');
    tree.Variable = require('./variable');
    tree.Property = require('./property');
    tree.Ruleset = require('./ruleset');
    tree.Element = require('./element');
    tree.Attribute = require('./attribute');
    tree.Combinator = require('./combinator');
    tree.Selector = require('./selector');
    tree.Quoted = require('./quoted');
    tree.Expression = require('./expression');
    tree.Declaration = require('./declaration');
    tree.Call = require('./call');
    tree.URL = require('./url');
    tree.Import = require('./import');
    tree.mixin = {
        Call: require('./mixin-call'),
        Definition: require('./mixin-definition')
    };
    tree.Comment = require('./comment');
    tree.Anonymous = require('./anonymous');
    tree.Value = require('./value');
    tree.JavaScript = require('./javascript');
    tree.Assignment = require('./assignment');
    tree.Condition = require('./condition');
    tree.Paren = require('./paren');
    tree.Media = require('./media');
    tree.UnicodeDescriptor = require('./unicode-descriptor');
    tree.Negative = require('./negative');
    tree.Extend = require('./extend');
    tree.VariableCall = require('./variable-call');
    tree.NamespaceValue = require('./namespace-value');
    
    module.exports = tree;
    
    },{"./anonymous":50,"./assignment":51,"./atrule":52,"./attribute":53,"./call":54,"./color":55,"./combinator":56,"./comment":57,"./condition":58,"./declaration":60,"./detached-ruleset":61,"./dimension":62,"./element":63,"./expression":64,"./extend":65,"./import":66,"./javascript":68,"./keyword":70,"./media":71,"./mixin-call":72,"./mixin-definition":73,"./namespace-value":74,"./negative":75,"./node":76,"./operation":77,"./paren":78,"./property":79,"./quoted":80,"./ruleset":81,"./selector":82,"./unicode-descriptor":83,"./unit":84,"./url":85,"./value":86,"./variable":88,"./variable-call":87}],68:[function(require,module,exports){
    var JsEvalNode = require('./js-eval-node'),
        Dimension = require('./dimension'),
        Quoted = require('./quoted'),
        Anonymous = require('./anonymous');
    
    var JavaScript = function (string, escaped, index, currentFileInfo) {
        this.escaped = escaped;
        this.expression = string;
        this._index = index;
        this._fileInfo = currentFileInfo;
    };
    JavaScript.prototype = new JsEvalNode();
    JavaScript.prototype.type = 'JavaScript';
    JavaScript.prototype.eval = function(context) {
        var result = this.evaluateJavaScript(this.expression, context);
        var type = typeof result;
    
        if (type === 'number' && !isNaN(result)) {
            return new Dimension(result);
        } else if (type === 'string') {
            return new Quoted('"' + result + '"', result, this.escaped, this._index);
        } else if (Array.isArray(result)) {
            return new Anonymous(result.join(', '));
        } else {
            return new Anonymous(result);
        }
    };
    
    module.exports = JavaScript;
    
    },{"./anonymous":50,"./dimension":62,"./js-eval-node":69,"./quoted":80}],69:[function(require,module,exports){
    var Node = require('./node'),
        Variable = require('./variable');
    
    var JsEvalNode = function() {
    };
    JsEvalNode.prototype = new Node();
    
    JsEvalNode.prototype.evaluateJavaScript = function (expression, context) {
        var result,
            that = this,
            evalContext = {};
    
        if (!context.javascriptEnabled) {
            throw { message: 'Inline JavaScript is not enabled. Is it set in your options?',
                filename: this.fileInfo().filename,
                index: this.getIndex() };
        }
    
        expression = expression.replace(/@\{([\w-]+)\}/g, function (_, name) {
            return that.jsify(new Variable('@' + name, that.getIndex(), that.fileInfo()).eval(context));
        });
    
        try {
            expression = new Function('return (' + expression + ')');
        } catch (e) {
            throw { message: 'JavaScript evaluation error: ' + e.message + ' from `' + expression + '`' ,
                filename: this.fileInfo().filename,
                index: this.getIndex() };
        }
    
        var variables = context.frames[0].variables();
        for (var k in variables) {
            if (variables.hasOwnProperty(k)) {
                /* jshint loopfunc:true */
                evalContext[k.slice(1)] = {
                    value: variables[k].value,
                    toJS: function () {
                        return this.value.eval(context).toCSS();
                    }
                };
            }
        }
    
        try {
            result = expression.call(evalContext);
        } catch (e) {
            throw { message: 'JavaScript evaluation error: \'' + e.name + ': ' + e.message.replace(/["]/g, '\'') + '\'' ,
                filename: this.fileInfo().filename,
                index: this.getIndex() };
        }
        return result;
    };
    JsEvalNode.prototype.jsify = function (obj) {
        if (Array.isArray(obj.value) && (obj.value.length > 1)) {
            return '[' + obj.value.map(function (v) { return v.toCSS(); }).join(', ') + ']';
        } else {
            return obj.toCSS();
        }
    };
    
    module.exports = JsEvalNode;
    
    },{"./node":76,"./variable":88}],70:[function(require,module,exports){
    var Node = require('./node');
    
    var Keyword = function (value) { this.value = value; };
    Keyword.prototype = new Node();
    Keyword.prototype.type = 'Keyword';
    Keyword.prototype.genCSS = function (context, output) {
        if (this.value === '%') { throw { type: 'Syntax', message: 'Invalid % without number' }; }
        output.add(this.value);
    };
    
    Keyword.True = new Keyword('true');
    Keyword.False = new Keyword('false');
    
    module.exports = Keyword;
    
    },{"./node":76}],71:[function(require,module,exports){
    var Ruleset = require('./ruleset'),
        Value = require('./value'),
        Selector = require('./selector'),
        Anonymous = require('./anonymous'),
        Expression = require('./expression'),
        AtRule = require('./atrule'),
        utils = require('../utils');
    
    var Media = function (value, features, index, currentFileInfo, visibilityInfo) {
        this._index = index;
        this._fileInfo = currentFileInfo;
    
        var selectors = (new Selector([], null, null, this._index, this._fileInfo)).createEmptySelectors();
    
        this.features = new Value(features);
        this.rules = [new Ruleset(selectors, value)];
        this.rules[0].allowImports = true;
        this.copyVisibilityInfo(visibilityInfo);
        this.allowRoot = true;
        this.setParent(selectors, this);
        this.setParent(this.features, this);
        this.setParent(this.rules, this);
    };
    Media.prototype = new AtRule();
    Media.prototype.type = 'Media';
    Media.prototype.isRulesetLike = function() { return true; };
    Media.prototype.accept = function (visitor) {
        if (this.features) {
            this.features = visitor.visit(this.features);
        }
        if (this.rules) {
            this.rules = visitor.visitArray(this.rules);
        }
    };
    Media.prototype.genCSS = function (context, output) {
        output.add('@media ', this._fileInfo, this._index);
        this.features.genCSS(context, output);
        this.outputRuleset(context, output, this.rules);
    };
    Media.prototype.eval = function (context) {
        if (!context.mediaBlocks) {
            context.mediaBlocks = [];
            context.mediaPath = [];
        }
    
        var media = new Media(null, [], this._index, this._fileInfo, this.visibilityInfo());
        if (this.debugInfo) {
            this.rules[0].debugInfo = this.debugInfo;
            media.debugInfo = this.debugInfo;
        }
        
        media.features = this.features.eval(context);
    
        context.mediaPath.push(media);
        context.mediaBlocks.push(media);
    
        this.rules[0].functionRegistry = context.frames[0].functionRegistry.inherit();
        context.frames.unshift(this.rules[0]);
        media.rules = [this.rules[0].eval(context)];
        context.frames.shift();
    
        context.mediaPath.pop();
    
        return context.mediaPath.length === 0 ? media.evalTop(context) :
                    media.evalNested(context);
    };
    Media.prototype.evalTop = function (context) {
        var result = this;
    
        // Render all dependent Media blocks.
        if (context.mediaBlocks.length > 1) {
            var selectors = (new Selector([], null, null, this.getIndex(), this.fileInfo())).createEmptySelectors();
            result = new Ruleset(selectors, context.mediaBlocks);
            result.multiMedia = true;
            result.copyVisibilityInfo(this.visibilityInfo());
            this.setParent(result, this);
        }
    
        delete context.mediaBlocks;
        delete context.mediaPath;
    
        return result;
    };
    Media.prototype.evalNested = function (context) {
        var i, value,
            path = context.mediaPath.concat([this]);
    
        // Extract the media-query conditions separated with `,` (OR).
        for (i = 0; i < path.length; i++) {
            value = path[i].features instanceof Value ?
                        path[i].features.value : path[i].features;
            path[i] = Array.isArray(value) ? value : [value];
        }
    
        // Trace all permutations to generate the resulting media-query.
        //
        // (a, b and c) with nested (d, e) ->
        //    a and d
        //    a and e
        //    b and c and d
        //    b and c and e
        this.features = new Value(this.permute(path).map(function (path) {
            path = path.map(function (fragment) {
                return fragment.toCSS ? fragment : new Anonymous(fragment);
            });
    
            for (i = path.length - 1; i > 0; i--) {
                path.splice(i, 0, new Anonymous('and'));
            }
    
            return new Expression(path);
        }));
        this.setParent(this.features, this);
    
        // Fake a tree-node that doesn't output anything.
        return new Ruleset([], []);
    };
    Media.prototype.permute = function (arr) {
        if (arr.length === 0) {
            return [];
        } else if (arr.length === 1) {
            return arr[0];
        } else {
            var result = [];
            var rest = this.permute(arr.slice(1));
            for (var i = 0; i < rest.length; i++) {
                for (var j = 0; j < arr[0].length; j++) {
                    result.push([arr[0][j]].concat(rest[i]));
                }
            }
            return result;
        }
    };
    Media.prototype.bubbleSelectors = function (selectors) {
        if (!selectors) {
            return;
        }
        this.rules = [new Ruleset(utils.copyArray(selectors), [this.rules[0]])];
        this.setParent(this.rules, this);
    };
    module.exports = Media;
    
    },{"../utils":89,"./anonymous":50,"./atrule":52,"./expression":64,"./ruleset":81,"./selector":82,"./value":86}],72:[function(require,module,exports){
    var Node = require('./node'),
        Selector = require('./selector'),
        MixinDefinition = require('./mixin-definition'),
        defaultFunc = require('../functions/default');
    
    var MixinCall = function (elements, args, index, currentFileInfo, important) {
        this.selector = new Selector(elements);
        this.arguments = args || [];
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.important = important;
        this.allowRoot = true;
        this.setParent(this.selector, this);
    };
    MixinCall.prototype = new Node();
    MixinCall.prototype.type = 'MixinCall';
    MixinCall.prototype.accept = function (visitor) {
        if (this.selector) {
            this.selector = visitor.visit(this.selector);
        }
        if (this.arguments.length) {
            this.arguments = visitor.visitArray(this.arguments);
        }
    };
    MixinCall.prototype.eval = function (context) {
        var mixins, mixin, mixinPath, args = [], arg, argValue,
            rules = [], match = false, i, m, f, isRecursive, isOneFound,
            candidates = [], candidate, conditionResult = [], defaultResult, defFalseEitherCase = -1,
            defNone = 0, defTrue = 1, defFalse = 2, count, originalRuleset, noArgumentsFilter;
    
        this.selector = this.selector.eval(context);
    
        function calcDefGroup(mixin, mixinPath) {
            var f, p, namespace;
    
            for (f = 0; f < 2; f++) {
                conditionResult[f] = true;
                defaultFunc.value(f);
                for (p = 0; p < mixinPath.length && conditionResult[f]; p++) {
                    namespace = mixinPath[p];
                    if (namespace.matchCondition) {
                        conditionResult[f] = conditionResult[f] && namespace.matchCondition(null, context);
                    }
                }
                if (mixin.matchCondition) {
                    conditionResult[f] = conditionResult[f] && mixin.matchCondition(args, context);
                }
            }
            if (conditionResult[0] || conditionResult[1]) {
                if (conditionResult[0] != conditionResult[1]) {
                    return conditionResult[1] ?
                        defTrue : defFalse;
                }
    
                return defNone;
            }
            return defFalseEitherCase;
        }
    
        for (i = 0; i < this.arguments.length; i++) {
            arg = this.arguments[i];
            argValue = arg.value.eval(context);
            if (arg.expand && Array.isArray(argValue.value)) {
                argValue = argValue.value;
                for (m = 0; m < argValue.length; m++) {
                    args.push({value: argValue[m]});
                }
            } else {
                args.push({name: arg.name, value: argValue});
            }
        }
    
        noArgumentsFilter = function(rule) {return rule.matchArgs(null, context);};
    
        for (i = 0; i < context.frames.length; i++) {
            if ((mixins = context.frames[i].find(this.selector, null, noArgumentsFilter)).length > 0) {
                isOneFound = true;
    
                // To make `default()` function independent of definition order we have two "subpasses" here.
                // At first we evaluate each guard *twice* (with `default() == true` and `default() == false`),
                // and build candidate list with corresponding flags. Then, when we know all possible matches,
                // we make a final decision.
    
                for (m = 0; m < mixins.length; m++) {
                    mixin = mixins[m].rule;
                    mixinPath = mixins[m].path;
                    isRecursive = false;
                    for (f = 0; f < context.frames.length; f++) {
                        if ((!(mixin instanceof MixinDefinition)) && mixin === (context.frames[f].originalRuleset || context.frames[f])) {
                            isRecursive = true;
                            break;
                        }
                    }
                    if (isRecursive) {
                        continue;
                    }
    
                    if (mixin.matchArgs(args, context)) {
                        candidate = {mixin: mixin, group: calcDefGroup(mixin, mixinPath)};
    
                        if (candidate.group !== defFalseEitherCase) {
                            candidates.push(candidate);
                        }
    
                        match = true;
                    }
                }
    
                defaultFunc.reset();
    
                count = [0, 0, 0];
                for (m = 0; m < candidates.length; m++) {
                    count[candidates[m].group]++;
                }
    
                if (count[defNone] > 0) {
                    defaultResult = defFalse;
                } else {
                    defaultResult = defTrue;
                    if ((count[defTrue] + count[defFalse]) > 1) {
                        throw { type: 'Runtime',
                            message: 'Ambiguous use of `default()` found when matching for `' + this.format(args) + '`',
                            index: this.getIndex(), filename: this.fileInfo().filename };
                    }
                }
    
                for (m = 0; m < candidates.length; m++) {
                    candidate = candidates[m].group;
                    if ((candidate === defNone) || (candidate === defaultResult)) {
                        try {
                            mixin = candidates[m].mixin;
                            if (!(mixin instanceof MixinDefinition)) {
                                originalRuleset = mixin.originalRuleset || mixin;
                                mixin = new MixinDefinition('', [], mixin.rules, null, false, null, originalRuleset.visibilityInfo());
                                mixin.originalRuleset = originalRuleset;
                            }
                            var newRules = mixin.evalCall(context, args, this.important).rules;
                            this._setVisibilityToReplacement(newRules);
                            Array.prototype.push.apply(rules, newRules);
                        } catch (e) {
                            throw { message: e.message, index: this.getIndex(), filename: this.fileInfo().filename, stack: e.stack };
                        }
                    }
                }
    
                if (match) {
                    return rules;
                }
            }
        }
        if (isOneFound) {
            throw { type:    'Runtime',
                message: 'No matching definition was found for `' + this.format(args) + '`',
                index:   this.getIndex(), filename: this.fileInfo().filename };
        } else {
            throw { type:    'Name',
                message: this.selector.toCSS().trim() + ' is undefined',
                index:   this.getIndex(), filename: this.fileInfo().filename };
        }
    };
    
    MixinCall.prototype._setVisibilityToReplacement = function (replacement) {
        var i, rule;
        if (this.blocksVisibility()) {
            for (i = 0; i < replacement.length; i++) {
                rule = replacement[i];
                rule.addVisibilityBlock();
            }
        }
    };
    MixinCall.prototype.format = function (args) {
        return this.selector.toCSS().trim() + '(' +
            (args ? args.map(function (a) {
                var argValue = '';
                if (a.name) {
                    argValue += a.name + ':';
                }
                if (a.value.toCSS) {
                    argValue += a.value.toCSS();
                } else {
                    argValue += '???';
                }
                return argValue;
            }).join(', ') : '') + ')';
    };
    module.exports = MixinCall;
    
    },{"../functions/default":25,"./mixin-definition":73,"./node":76,"./selector":82}],73:[function(require,module,exports){
    var Selector = require('./selector'),
        Element = require('./element'),
        Ruleset = require('./ruleset'),
        Declaration = require('./declaration'),
        DetachedRuleset = require('./detached-ruleset'),
        Expression = require('./expression'),
        contexts = require('../contexts'),
        utils = require('../utils');
    
    var Definition = function (name, params, rules, condition, variadic, frames, visibilityInfo) {
        this.name = name || 'anonymous mixin';
        this.selectors = [new Selector([new Element(null, name, false, this._index, this._fileInfo)])];
        this.params = params;
        this.condition = condition;
        this.variadic = variadic;
        this.arity = params.length;
        this.rules = rules;
        this._lookups = {};
        var optionalParameters = [];
        this.required = params.reduce(function (count, p) {
            if (!p.name || (p.name && !p.value)) {
                return count + 1;
            }
            else {
                optionalParameters.push(p.name);
                return count;
            }
        }, 0);
        this.optionalParameters = optionalParameters;
        this.frames = frames;
        this.copyVisibilityInfo(visibilityInfo);
        this.allowRoot = true;
    };
    Definition.prototype = new Ruleset();
    Definition.prototype.type = 'MixinDefinition';
    Definition.prototype.evalFirst = true;
    Definition.prototype.accept = function (visitor) {
        if (this.params && this.params.length) {
            this.params = visitor.visitArray(this.params);
        }
        this.rules = visitor.visitArray(this.rules);
        if (this.condition) {
            this.condition = visitor.visit(this.condition);
        }
    };
    Definition.prototype.evalParams = function (context, mixinEnv, args, evaldArguments) {
        /* jshint boss:true */
        var frame = new Ruleset(null, null),
            varargs, arg,
            params = utils.copyArray(this.params),
            i, j, val, name, isNamedFound, argIndex, argsLength = 0;
    
        if (mixinEnv.frames && mixinEnv.frames[0] && mixinEnv.frames[0].functionRegistry) {
            frame.functionRegistry = mixinEnv.frames[0].functionRegistry.inherit();
        }
        mixinEnv = new contexts.Eval(mixinEnv, [frame].concat(mixinEnv.frames));
    
        if (args) {
            args = utils.copyArray(args);
            argsLength = args.length;
    
            for (i = 0; i < argsLength; i++) {
                arg = args[i];
                if (name = (arg && arg.name)) {
                    isNamedFound = false;
                    for (j = 0; j < params.length; j++) {
                        if (!evaldArguments[j] && name === params[j].name) {
                            evaldArguments[j] = arg.value.eval(context);
                            frame.prependRule(new Declaration(name, arg.value.eval(context)));
                            isNamedFound = true;
                            break;
                        }
                    }
                    if (isNamedFound) {
                        args.splice(i, 1);
                        i--;
                        continue;
                    } else {
                        throw { type: 'Runtime', message: 'Named argument for ' + this.name +
                            ' ' + args[i].name + ' not found' };
                    }
                }
            }
        }
        argIndex = 0;
        for (i = 0; i < params.length; i++) {
            if (evaldArguments[i]) { continue; }
    
            arg = args && args[argIndex];
    
            if (name = params[i].name) {
                if (params[i].variadic) {
                    varargs = [];
                    for (j = argIndex; j < argsLength; j++) {
                        varargs.push(args[j].value.eval(context));
                    }
                    frame.prependRule(new Declaration(name, new Expression(varargs).eval(context)));
                } else {
                    val = arg && arg.value;
                    if (val) {
                        // This was a mixin call, pass in a detached ruleset of it's eval'd rules
                        if (Array.isArray(val)) {
                            val = new DetachedRuleset(new Ruleset('', val));
                        }
                        else {
                            val = val.eval(context);
                        }
                    } else if (params[i].value) {
                        val = params[i].value.eval(mixinEnv);
                        frame.resetCache();
                    } else {
                        throw { type: 'Runtime', message: 'wrong number of arguments for ' + this.name +
                            ' (' + argsLength + ' for ' + this.arity + ')' };
                    }
    
                    frame.prependRule(new Declaration(name, val));
                    evaldArguments[i] = val;
                }
            }
    
            if (params[i].variadic && args) {
                for (j = argIndex; j < argsLength; j++) {
                    evaldArguments[j] = args[j].value.eval(context);
                }
            }
            argIndex++;
        }
    
        return frame;
    };
    Definition.prototype.makeImportant = function() {
        var rules = !this.rules ? this.rules : this.rules.map(function (r) {
            if (r.makeImportant) {
                return r.makeImportant(true);
            } else {
                return r;
            }
        });
        var result = new Definition(this.name, this.params, rules, this.condition, this.variadic, this.frames);
        return result;
    };
    Definition.prototype.eval = function (context) {
        return new Definition(this.name, this.params, this.rules, this.condition, this.variadic, this.frames || utils.copyArray(context.frames));
    };
    Definition.prototype.evalCall = function (context, args, important) {
        var _arguments = [],
            mixinFrames = this.frames ? this.frames.concat(context.frames) : context.frames,
            frame = this.evalParams(context, new contexts.Eval(context, mixinFrames), args, _arguments),
            rules, ruleset;
    
        frame.prependRule(new Declaration('@arguments', new Expression(_arguments).eval(context)));
    
        rules = utils.copyArray(this.rules);
    
        ruleset = new Ruleset(null, rules);
        ruleset.originalRuleset = this;
        ruleset = ruleset.eval(new contexts.Eval(context, [this, frame].concat(mixinFrames)));
        if (important) {
            ruleset = ruleset.makeImportant();
        }
        return ruleset;
    };
    Definition.prototype.matchCondition = function (args, context) {
        if (this.condition && !this.condition.eval(
            new contexts.Eval(context,
                [this.evalParams(context, /* the parameter variables */
                    new contexts.Eval(context, this.frames ? this.frames.concat(context.frames) : context.frames), args, [])]
                .concat(this.frames || []) // the parent namespace/mixin frames
                .concat(context.frames)))) { // the current environment frames
            return false;
        }
        return true;
    };
    Definition.prototype.matchArgs = function (args, context) {
        var allArgsCnt = (args && args.length) || 0, len, optionalParameters = this.optionalParameters;
        var requiredArgsCnt = !args ? 0 : args.reduce(function (count, p) {
            if (optionalParameters.indexOf(p.name) < 0) {
                return count + 1;
            } else {
                return count;
            }
        }, 0);
    
        if (!this.variadic) {
            if (requiredArgsCnt < this.required) {
                return false;
            }
            if (allArgsCnt > this.params.length) {
                return false;
            }
        } else {
            if (requiredArgsCnt < (this.required - 1)) {
                return false;
            }
        }
    
        // check patterns
        len = Math.min(requiredArgsCnt, this.arity);
    
        for (var i = 0; i < len; i++) {
            if (!this.params[i].name && !this.params[i].variadic) {
                if (args[i].value.eval(context).toCSS() != this.params[i].value.eval(context).toCSS()) {
                    return false;
                }
            }
        }
        return true;
    };
    module.exports = Definition;
    
    },{"../contexts":13,"../utils":89,"./declaration":60,"./detached-ruleset":61,"./element":63,"./expression":64,"./ruleset":81,"./selector":82}],74:[function(require,module,exports){
    var Node = require('./node'),
        Variable = require('./variable'),
        Ruleset = require('./ruleset'),
        Selector = require('./selector');
    
    var NamespaceValue = function (ruleCall, lookups, important, index, fileInfo) {
        this.value = ruleCall;
        this.lookups = lookups;
        this.important = important;
        this._index = index;
        this._fileInfo = fileInfo;
    };
    NamespaceValue.prototype = new Node();
    NamespaceValue.prototype.type = 'NamespaceValue';
    NamespaceValue.prototype.eval = function (context) {
        var i, j, name, rules = this.value.eval(context);
        
        for (i = 0; i < this.lookups.length; i++) {
            name = this.lookups[i];
    
            /**
             * Eval'd DRs return rulesets.
             * Eval'd mixins return rules, so let's make a ruleset if we need it.
             * We need to do this because of late parsing of values
             */
            if (Array.isArray(rules)) {
                rules = new Ruleset([new Selector()], rules);
            }
    
            if (name === '') {
                rules = rules.lastDeclaration();
            }
            else if (name.charAt(0) === '@') {
                if (name.charAt(1) === '@') {
                    name = '@' + new Variable(name.substr(1)).eval(context).value;
                }
                if (rules.variables) {
                    rules = rules.variable(name);
                }
                
                if (!rules) {
                    throw { type: 'Name',
                        message: 'variable ' + name + ' not found',
                        filename: this.fileInfo().filename,
                        index: this.getIndex() };
                }
            }
            else {
                if (name.substring(0, 2) === '$@') {
                    name = '$' + new Variable(name.substr(1)).eval(context).value;
                }
                else {
                    name = name.charAt(0) === '$' ? name : '$' + name;
                }
                if (rules.properties) {
                    rules = rules.property(name);
                }
            
                if (!rules) {
                    throw { type: 'Name',
                        message: 'property "' + name.substr(1) + '" not found',
                        filename: this.fileInfo().filename,
                        index: this.getIndex() };
                }
                // Properties are an array of values, since a ruleset can have multiple props.
                // We pick the last one (the "cascaded" value)
                rules = rules[rules.length - 1];
            }
    
            if (rules.value) {
                rules = rules.eval(context).value;
            }
            if (rules.ruleset) {
                rules = rules.ruleset.eval(context);
            }
        }
        return rules;
    };
    module.exports = NamespaceValue;
    
    },{"./node":76,"./ruleset":81,"./selector":82,"./variable":88}],75:[function(require,module,exports){
    var Node = require('./node'),
        Operation = require('./operation'),
        Dimension = require('./dimension');
    
    var Negative = function (node) {
        this.value = node;
    };
    Negative.prototype = new Node();
    Negative.prototype.type = 'Negative';
    Negative.prototype.genCSS = function (context, output) {
        output.add('-');
        this.value.genCSS(context, output);
    };
    Negative.prototype.eval = function (context) {
        if (context.isMathOn()) {
            return (new Operation('*', [new Dimension(-1), this.value])).eval(context);
        }
        return new Negative(this.value.eval(context));
    };
    module.exports = Negative;
    
    },{"./dimension":62,"./node":76,"./operation":77}],76:[function(require,module,exports){
    var Node = function() {
        this.parent = null;
        this.visibilityBlocks = undefined;
        this.nodeVisible = undefined;
        this.rootNode = null;
        this.parsed = null;
    
        var self = this;
        Object.defineProperty(this, 'currentFileInfo', {
            get: function() { return self.fileInfo(); }
        });
        Object.defineProperty(this, 'index', {
            get: function() { return self.getIndex(); }
        });
    
    };
    Node.prototype.setParent = function(nodes, parent) {
        function set(node) {
            if (node && node instanceof Node) {
                node.parent = parent;
            }
        }
        if (Array.isArray(nodes)) {
            nodes.forEach(set);
        }
        else {
            set(nodes);
        }
    };
    Node.prototype.getIndex = function() {
        return this._index || (this.parent && this.parent.getIndex()) || 0;
    };
    Node.prototype.fileInfo = function() {
        return this._fileInfo || (this.parent && this.parent.fileInfo()) || {};
    };
    Node.prototype.isRulesetLike = function() { return false; };
    Node.prototype.toCSS = function (context) {
        var strs = [];
        this.genCSS(context, {
            add: function(chunk, fileInfo, index) {
                strs.push(chunk);
            },
            isEmpty: function () {
                return strs.length === 0;
            }
        });
        return strs.join('');
    };
    Node.prototype.genCSS = function (context, output) {
        output.add(this.value);
    };
    Node.prototype.accept = function (visitor) {
        this.value = visitor.visit(this.value);
    };
    Node.prototype.eval = function () { return this; };
    Node.prototype._operate = function (context, op, a, b) {
        switch (op) {
            case '+': return a + b;
            case '-': return a - b;
            case '*': return a * b;
            case '/': return a / b;
        }
    };
    Node.prototype.fround = function(context, value) {
        var precision = context && context.numPrecision;
        // add "epsilon" to ensure numbers like 1.000000005 (represented as 1.000000004999...) are properly rounded:
        return (precision) ? Number((value + 2e-16).toFixed(precision)) : value;
    };
    Node.compare = function (a, b) {
        /* returns:
         -1: a < b
         0: a = b
         1: a > b
         and *any* other value for a != b (e.g. undefined, NaN, -2 etc.) */
    
        if ((a.compare) &&
            // for "symmetric results" force toCSS-based comparison
            // of Quoted or Anonymous if either value is one of those
            !(b.type === 'Quoted' || b.type === 'Anonymous')) {
            return a.compare(b);
        } else if (b.compare) {
            return -b.compare(a);
        } else if (a.type !== b.type) {
            return undefined;
        }
    
        a = a.value;
        b = b.value;
        if (!Array.isArray(a)) {
            return a === b ? 0 : undefined;
        }
        if (a.length !== b.length) {
            return undefined;
        }
        for (var i = 0; i < a.length; i++) {
            if (Node.compare(a[i], b[i]) !== 0) {
                return undefined;
            }
        }
        return 0;
    };
    
    Node.numericCompare = function (a, b) {
        return a  <  b ? -1
            : a === b ?  0
            : a  >  b ?  1 : undefined;
    };
    // Returns true if this node represents root of ast imported by reference
    Node.prototype.blocksVisibility = function () {
        if (this.visibilityBlocks == null) {
            this.visibilityBlocks = 0;
        }
        return this.visibilityBlocks !== 0;
    };
    Node.prototype.addVisibilityBlock = function () {
        if (this.visibilityBlocks == null) {
            this.visibilityBlocks = 0;
        }
        this.visibilityBlocks = this.visibilityBlocks + 1;
    };
    Node.prototype.removeVisibilityBlock = function () {
        if (this.visibilityBlocks == null) {
            this.visibilityBlocks = 0;
        }
        this.visibilityBlocks = this.visibilityBlocks - 1;
    };
    // Turns on node visibility - if called node will be shown in output regardless
    // of whether it comes from import by reference or not
    Node.prototype.ensureVisibility = function () {
        this.nodeVisible = true;
    };
    // Turns off node visibility - if called node will NOT be shown in output regardless
    // of whether it comes from import by reference or not
    Node.prototype.ensureInvisibility = function () {
        this.nodeVisible = false;
    };
    // return values:
    // false - the node must not be visible
    // true - the node must be visible
    // undefined or null - the node has the same visibility as its parent
    Node.prototype.isVisible = function () {
        return this.nodeVisible;
    };
    Node.prototype.visibilityInfo = function() {
        return {
            visibilityBlocks: this.visibilityBlocks,
            nodeVisible: this.nodeVisible
        };
    };
    Node.prototype.copyVisibilityInfo = function(info) {
        if (!info) {
            return;
        }
        this.visibilityBlocks = info.visibilityBlocks;
        this.nodeVisible = info.nodeVisible;
    };
    module.exports = Node;
    
    },{}],77:[function(require,module,exports){
    var Node = require('./node'),
        Color = require('./color'),
        Dimension = require('./dimension'),
        MATH = require('../constants').Math;
    
    var Operation = function (op, operands, isSpaced) {
        this.op = op.trim();
        this.operands = operands;
        this.isSpaced = isSpaced;
    };
    Operation.prototype = new Node();
    Operation.prototype.type = 'Operation';
    Operation.prototype.accept = function (visitor) {
        this.operands = visitor.visit(this.operands);
    };
    Operation.prototype.eval = function (context) {
        var a = this.operands[0].eval(context),
            b = this.operands[1].eval(context),
            op;
    
        if (context.isMathOn(this.op)) {
            op = this.op === './' ? '/' : this.op;
            if (a instanceof Dimension && b instanceof Color) {
                a = a.toColor();
            }
            if (b instanceof Dimension && a instanceof Color) {
                b = b.toColor();
            }
            if (!a.operate) {
                if (a instanceof Operation && a.op === '/' && context.math === MATH.PARENS_DIVISION) {
                    return new Operation(this.op, [a, b], this.isSpaced);
                }
                throw { type: 'Operation',
                    message: 'Operation on an invalid type' };
            }
    
            return a.operate(context, op, b);
        } else {
            return new Operation(this.op, [a, b], this.isSpaced);
        }
    };
    Operation.prototype.genCSS = function (context, output) {
        this.operands[0].genCSS(context, output);
        if (this.isSpaced) {
            output.add(' ');
        }
        output.add(this.op);
        if (this.isSpaced) {
            output.add(' ');
        }
        this.operands[1].genCSS(context, output);
    };
    
    module.exports = Operation;
    
    },{"../constants":12,"./color":55,"./dimension":62,"./node":76}],78:[function(require,module,exports){
    var Node = require('./node');
    
    var Paren = function (node) {
        this.value = node;
    };
    Paren.prototype = new Node();
    Paren.prototype.type = 'Paren';
    Paren.prototype.genCSS = function (context, output) {
        output.add('(');
        this.value.genCSS(context, output);
        output.add(')');
    };
    Paren.prototype.eval = function (context) {
        return new Paren(this.value.eval(context));
    };
    module.exports = Paren;
    
    },{"./node":76}],79:[function(require,module,exports){
    var Node = require('./node'),
        Declaration = require('./declaration');
    
    var Property = function (name, index, currentFileInfo) {
        this.name = name;
        this._index = index;
        this._fileInfo = currentFileInfo;
    };
    Property.prototype = new Node();
    Property.prototype.type = 'Property';
    Property.prototype.eval = function (context) {
        var property, name = this.name;
        // TODO: shorten this reference
        var mergeRules = context.pluginManager.less.visitors.ToCSSVisitor.prototype._mergeRules;
    
        if (this.evaluating) {
            throw { type: 'Name',
                message: 'Recursive property reference for ' + name,
                filename: this.fileInfo().filename,
                index: this.getIndex() };
        }
    
        this.evaluating = true;
    
        property = this.find(context.frames, function (frame) {
    
            var v, vArr = frame.property(name);
            if (vArr) {
                for (var i = 0; i < vArr.length; i++) {
                    v = vArr[i];
    
                    vArr[i] = new Declaration(v.name,
                        v.value,
                        v.important,
                        v.merge,
                        v.index,
                        v.currentFileInfo,
                        v.inline,
                        v.variable
                    );
                }
                mergeRules(vArr);
    
                v = vArr[vArr.length - 1];
                if (v.important) {
                    var importantScope = context.importantScope[context.importantScope.length - 1];
                    importantScope.important = v.important;
                }
                v = v.value.eval(context);
                return v;
            }
        });
        if (property) {
            this.evaluating = false;
            return property;
        } else {
            throw { type: 'Name',
                message: 'Property \'' + name + '\' is undefined',
                filename: this.currentFileInfo.filename,
                index: this.index };
        }
    };
    Property.prototype.find = function (obj, fun) {
        for (var i = 0, r; i < obj.length; i++) {
            r = fun.call(obj, obj[i]);
            if (r) { return r; }
        }
        return null;
    };
    module.exports = Property;
    
    },{"./declaration":60,"./node":76}],80:[function(require,module,exports){
    var Node = require('./node'),
        Variable = require('./variable'),
        Property = require('./property');
    
    var Quoted = function (str, content, escaped, index, currentFileInfo) {
        this.escaped = (escaped == null) ? true : escaped;
        this.value = content || '';
        this.quote = str.charAt(0);
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.variableRegex = /@\{([\w-]+)\}/g;
        this.propRegex = /\$\{([\w-]+)\}/g;
    };
    Quoted.prototype = new Node();
    Quoted.prototype.type = 'Quoted';
    Quoted.prototype.genCSS = function (context, output) {
        if (!this.escaped) {
            output.add(this.quote, this.fileInfo(), this.getIndex());
        }
        output.add(this.value);
        if (!this.escaped) {
            output.add(this.quote);
        }
    };
    Quoted.prototype.containsVariables = function() {
        return this.value.match(this.variableRegex);
    };
    Quoted.prototype.eval = function (context) {
        var that = this, value = this.value;
        var variableReplacement = function (_, name) {
            var v = new Variable('@' + name, that.getIndex(), that.fileInfo()).eval(context, true);
            return (v instanceof Quoted) ? v.value : v.toCSS();
        };
        var propertyReplacement = function (_, name) {
            var v = new Property('$' + name, that.getIndex(), that.fileInfo()).eval(context, true);
            return (v instanceof Quoted) ? v.value : v.toCSS();
        };
        function iterativeReplace(value, regexp, replacementFnc) {
            var evaluatedValue = value;
            do {
                value = evaluatedValue;
                evaluatedValue = value.replace(regexp, replacementFnc);
            } while (value !== evaluatedValue);
            return evaluatedValue;
        }
        value = iterativeReplace(value, this.variableRegex, variableReplacement);
        value = iterativeReplace(value, this.propRegex, propertyReplacement);
        return new Quoted(this.quote + value + this.quote, value, this.escaped, this.getIndex(), this.fileInfo());
    };
    Quoted.prototype.compare = function (other) {
        // when comparing quoted strings allow the quote to differ
        if (other.type === 'Quoted' && !this.escaped && !other.escaped) {
            return Node.numericCompare(this.value, other.value);
        } else {
            return other.toCSS && this.toCSS() === other.toCSS() ? 0 : undefined;
        }
    };
    module.exports = Quoted;
    
    },{"./node":76,"./property":79,"./variable":88}],81:[function(require,module,exports){
    var Node = require('./node'),
        Declaration = require('./declaration'),
        Keyword = require('./keyword'),
        Comment = require('./comment'),
        Paren = require('./paren'),
        Selector = require('./selector'),
        Element = require('./element'),
        Anonymous = require('./anonymous'),
        contexts = require('../contexts'),
        globalFunctionRegistry = require('../functions/function-registry'),
        defaultFunc = require('../functions/default'),
        getDebugInfo = require('./debug-info'),
        utils = require('../utils');
    
    var Ruleset = function (selectors, rules, strictImports, visibilityInfo) {
        this.selectors = selectors;
        this.rules = rules;
        this._lookups = {};
        this._variables = null;
        this._properties = null;
        this.strictImports = strictImports;
        this.copyVisibilityInfo(visibilityInfo);
        this.allowRoot = true;
    
        this.setParent(this.selectors, this);
        this.setParent(this.rules, this);
    
    };
    Ruleset.prototype = new Node();
    Ruleset.prototype.type = 'Ruleset';
    Ruleset.prototype.isRuleset = true;
    Ruleset.prototype.isRulesetLike = function() { return true; };
    Ruleset.prototype.accept = function (visitor) {
        if (this.paths) {
            this.paths = visitor.visitArray(this.paths, true);
        } else if (this.selectors) {
            this.selectors = visitor.visitArray(this.selectors);
        }
        if (this.rules && this.rules.length) {
            this.rules = visitor.visitArray(this.rules);
        }
    };
    Ruleset.prototype.eval = function (context) {
        var that = this, selectors, selCnt, selector, i, hasVariable, hasOnePassingSelector = false;
    
        if (this.selectors && (selCnt = this.selectors.length)) {
            selectors = new Array(selCnt);
            defaultFunc.error({
                type: 'Syntax',
                message: 'it is currently only allowed in parametric mixin guards,'
            });
    
            for (i = 0; i < selCnt; i++) {
                selector = this.selectors[i].eval(context);
                for (var j = 0; j < selector.elements.length; j++) {
                    if (selector.elements[j].isVariable) {
                        hasVariable = true;
                        break;
                    }
                }
                selectors[i] = selector;
                if (selector.evaldCondition) {
                    hasOnePassingSelector = true;
                }
            }
    
            if (hasVariable) {
                var toParseSelectors = new Array(selCnt);
                for (i = 0; i < selCnt; i++) {
                    selector = selectors[i];
                    toParseSelectors[i] = selector.toCSS(context);
                }
                this.parse.parseNode(
                    toParseSelectors.join(','),
                    ["selectors"], 
                    selectors[0].getIndex(), 
                    selectors[0].fileInfo(), 
                    function(err, result) {
                        if (result) {
                            selectors = utils.flattenArray(result);
                        }
                    });
            }
    
            defaultFunc.reset();
        } else {
            hasOnePassingSelector = true;
        }
    
        var rules = this.rules ? utils.copyArray(this.rules) : null,
            ruleset = new Ruleset(selectors, rules, this.strictImports, this.visibilityInfo()),
            rule, subRule;
    
        ruleset.originalRuleset = this;
        ruleset.root = this.root;
        ruleset.firstRoot = this.firstRoot;
        ruleset.allowImports = this.allowImports;
    
        if (this.debugInfo) {
            ruleset.debugInfo = this.debugInfo;
        }
    
        if (!hasOnePassingSelector) {
            rules.length = 0;
        }
    
        // inherit a function registry from the frames stack when possible;
        // otherwise from the global registry
        ruleset.functionRegistry = (function (frames) {
            var i = 0,
                n = frames.length,
                found;
            for ( ; i !== n ; ++i ) {
                found = frames[ i ].functionRegistry;
                if ( found ) { return found; }
            }
            return globalFunctionRegistry;
        }(context.frames)).inherit();
    
        // push the current ruleset to the frames stack
        var ctxFrames = context.frames;
        ctxFrames.unshift(ruleset);
    
        // currrent selectors
        var ctxSelectors = context.selectors;
        if (!ctxSelectors) {
            context.selectors = ctxSelectors = [];
        }
        ctxSelectors.unshift(this.selectors);
    
        // Evaluate imports
        if (ruleset.root || ruleset.allowImports || !ruleset.strictImports) {
            ruleset.evalImports(context);
        }
    
        // Store the frames around mixin definitions,
        // so they can be evaluated like closures when the time comes.
        var rsRules = ruleset.rules;
        for (i = 0; (rule = rsRules[i]); i++) {
            if (rule.evalFirst) {
                rsRules[i] = rule.eval(context);
            }
        }
    
        var mediaBlockCount = (context.mediaBlocks && context.mediaBlocks.length) || 0;
    
        // Evaluate mixin calls.
        for (i = 0; (rule = rsRules[i]); i++) {
            if (rule.type === 'MixinCall') {
                /* jshint loopfunc:true */
                rules = rule.eval(context).filter(function(r) {
                    if ((r instanceof Declaration) && r.variable) {
                        // do not pollute the scope if the variable is
                        // already there. consider returning false here
                        // but we need a way to "return" variable from mixins
                        return !(ruleset.variable(r.name));
                    }
                    return true;
                });
                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
                i += rules.length - 1;
                ruleset.resetCache();
            } else if (rule.type ===  'VariableCall') {
                /* jshint loopfunc:true */
                rules = rule.eval(context).rules.filter(function(r) {
                    if ((r instanceof Declaration) && r.variable) {
                        // do not pollute the scope at all
                        return false;
                    }
                    return true;
                });
                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
                i += rules.length - 1;
                ruleset.resetCache();
            }
        }
    
        // Evaluate everything else
        for (i = 0; (rule = rsRules[i]); i++) {
            if (!rule.evalFirst) {
                rsRules[i] = rule = rule.eval ? rule.eval(context) : rule;
            }
        }
    
        // Evaluate everything else
        for (i = 0; (rule = rsRules[i]); i++) {
            // for rulesets, check if it is a css guard and can be removed
            if (rule instanceof Ruleset && rule.selectors && rule.selectors.length === 1) {
                // check if it can be folded in (e.g. & where)
                if (rule.selectors[0] && rule.selectors[0].isJustParentSelector()) {
                    rsRules.splice(i--, 1);
    
                    for (var j = 0; (subRule = rule.rules[j]); j++) {
                        if (subRule instanceof Node) {
                            subRule.copyVisibilityInfo(rule.visibilityInfo());
                            if (!(subRule instanceof Declaration) || !subRule.variable) {
                                rsRules.splice(++i, 0, subRule);
                            }
                        }
                    }
                }
            }
        }
    
        // Pop the stack
        ctxFrames.shift();
        ctxSelectors.shift();
    
        if (context.mediaBlocks) {
            for (i = mediaBlockCount; i < context.mediaBlocks.length; i++) {
                context.mediaBlocks[i].bubbleSelectors(selectors);
            }
        }
    
        return ruleset;
    };
    Ruleset.prototype.evalImports = function(context) {
        var rules = this.rules, i, importRules;
        if (!rules) { return; }
    
        for (i = 0; i < rules.length; i++) {
            if (rules[i].type === 'Import') {
                importRules = rules[i].eval(context);
                if (importRules && (importRules.length || importRules.length === 0)) {
                    rules.splice.apply(rules, [i, 1].concat(importRules));
                    i += importRules.length - 1;
                } else {
                    rules.splice(i, 1, importRules);
                }
                this.resetCache();
            }
        }
    };
    Ruleset.prototype.makeImportant = function() {
        var result = new Ruleset(this.selectors, this.rules.map(function (r) {
            if (r.makeImportant) {
                return r.makeImportant();
            } else {
                return r;
            }
        }), this.strictImports, this.visibilityInfo());
    
        return result;
    };
    Ruleset.prototype.matchArgs = function (args) {
        return !args || args.length === 0;
    };
    // lets you call a css selector with a guard
    Ruleset.prototype.matchCondition = function (args, context) {
        var lastSelector = this.selectors[this.selectors.length - 1];
        if (!lastSelector.evaldCondition) {
            return false;
        }
        if (lastSelector.condition &&
            !lastSelector.condition.eval(
                new contexts.Eval(context,
                    context.frames))) {
            return false;
        }
        return true;
    };
    Ruleset.prototype.resetCache = function () {
        this._rulesets = null;
        this._variables = null;
        this._properties = null;
        this._lookups = {};
    };
    Ruleset.prototype.variables = function () {
        if (!this._variables) {
            this._variables = !this.rules ? {} : this.rules.reduce(function (hash, r) {
                if (r instanceof Declaration && r.variable === true) {
                    hash[r.name] = r;
                }
                // when evaluating variables in an import statement, imports have not been eval'd
                // so we need to go inside import statements.
                // guard against root being a string (in the case of inlined less)
                if (r.type === 'Import' && r.root && r.root.variables) {
                    var vars = r.root.variables();
                    for (var name in vars) {
                        if (vars.hasOwnProperty(name)) {
                            hash[name] = r.root.variable(name);
                        }
                    }
                }
                return hash;
            }, {});
        }
        return this._variables;
    };
    Ruleset.prototype.properties = function () {
        if (!this._properties) {
            this._properties = !this.rules ? {} : this.rules.reduce(function (hash, r) {
                if (r instanceof Declaration && r.variable !== true) {
                    var name = (r.name.length === 1) && (r.name[0] instanceof Keyword) ?
                        r.name[0].value : r.name;
                    // Properties don't overwrite as they can merge
                    if (!hash['$' + name]) {
                        hash['$' + name] = [ r ];
                    }
                    else {
                        hash['$' + name].push(r);
                    }
                }
                return hash;
            }, {});
        }
        return this._properties;
    };
    Ruleset.prototype.variable = function (name) {
        var decl = this.variables()[name];
        if (decl) {
            return this.parseValue(decl);
        }
    };
    Ruleset.prototype.property = function (name) {
        var decl = this.properties()[name];
        if (decl) {
            return this.parseValue(decl);
        }
    };
    Ruleset.prototype.lastDeclaration = function () {
        for (var i = this.rules.length; i > 0; i--) {
            var decl = this.rules[i - 1];
            if (decl instanceof Declaration) {
                return this.parseValue(decl);
            }
        }
    };
    Ruleset.prototype.parseValue = function(toParse) {
        var self = this;
        function transformDeclaration(decl) {
            if (decl.value instanceof Anonymous && !decl.parsed) {
                if (typeof decl.value.value === 'string') {
                    this.parse.parseNode(
                        decl.value.value,
                        ['value', 'important'], 
                        decl.value.getIndex(), 
                        decl.fileInfo(), 
                        function(err, result) {
                            if (err) {
                                decl.parsed = true;
                            }
                            if (result) {
                                decl.value = result[0];
                                decl.important = result[1] || '';
                                decl.parsed = true;
                            }
                        });
                } else {
                    decl.parsed = true;
                }
    
                return decl;
            }
            else {
                return decl;
            }
        }
        if (!Array.isArray(toParse)) {
            return transformDeclaration.call(self, toParse);
        }
        else {
            var nodes = [];
            toParse.forEach(function(n) {
                nodes.push(transformDeclaration.call(self, n));
            });
            return nodes;
        }
    };
    Ruleset.prototype.rulesets = function () {
        if (!this.rules) { return []; }
    
        var filtRules = [], rules = this.rules,
            i, rule;
    
        for (i = 0; (rule = rules[i]); i++) {
            if (rule.isRuleset) {
                filtRules.push(rule);
            }
        }
    
        return filtRules;
    };
    Ruleset.prototype.prependRule = function (rule) {
        var rules = this.rules;
        if (rules) {
            rules.unshift(rule);
        } else {
            this.rules = [ rule ];
        }
        this.setParent(rule, this);
    };
    Ruleset.prototype.find = function (selector, self, filter) {
        self = self || this;
        var rules = [], match, foundMixins,
            key = selector.toCSS();
    
        if (key in this._lookups) { return this._lookups[key]; }
    
        this.rulesets().forEach(function (rule) {
            if (rule !== self) {
                for (var j = 0; j < rule.selectors.length; j++) {
                    match = selector.match(rule.selectors[j]);
                    if (match) {
                        if (selector.elements.length > match) {
                            if (!filter || filter(rule)) {
                                foundMixins = rule.find(new Selector(selector.elements.slice(match)), self, filter);
                                for (var i = 0; i < foundMixins.length; ++i) {
                                    foundMixins[i].path.push(rule);
                                }
                                Array.prototype.push.apply(rules, foundMixins);
                            }
                        } else {
                            rules.push({ rule: rule, path: []});
                        }
                        break;
                    }
                }
            }
        });
        this._lookups[key] = rules;
        return rules;
    };
    Ruleset.prototype.genCSS = function (context, output) {
        var i, j,
            charsetRuleNodes = [],
            ruleNodes = [],
            debugInfo,     // Line number debugging
            rule,
            path;
    
        context.tabLevel = (context.tabLevel || 0);
    
        if (!this.root) {
            context.tabLevel++;
        }
    
        var tabRuleStr = context.compress ? '' : Array(context.tabLevel + 1).join('  '),
            tabSetStr = context.compress ? '' : Array(context.tabLevel).join('  '),
            sep;
    
        var charsetNodeIndex = 0;
        var importNodeIndex = 0;
        for (i = 0; (rule = this.rules[i]); i++) {
            if (rule instanceof Comment) {
                if (importNodeIndex === i) {
                    importNodeIndex++;
                }
                ruleNodes.push(rule);
            } else if (rule.isCharset && rule.isCharset()) {
                ruleNodes.splice(charsetNodeIndex, 0, rule);
                charsetNodeIndex++;
                importNodeIndex++;
            } else if (rule.type === 'Import') {
                ruleNodes.splice(importNodeIndex, 0, rule);
                importNodeIndex++;
            } else {
                ruleNodes.push(rule);
            }
        }
        ruleNodes = charsetRuleNodes.concat(ruleNodes);
    
        // If this is the root node, we don't render
        // a selector, or {}.
        if (!this.root) {
            debugInfo = getDebugInfo(context, this, tabSetStr);
    
            if (debugInfo) {
                output.add(debugInfo);
                output.add(tabSetStr);
            }
    
            var paths = this.paths, pathCnt = paths.length,
                pathSubCnt;
    
            sep = context.compress ? ',' : (',\n' + tabSetStr);
    
            for (i = 0; i < pathCnt; i++) {
                path = paths[i];
                if (!(pathSubCnt = path.length)) { continue; }
                if (i > 0) { output.add(sep); }
    
                context.firstSelector = true;
                path[0].genCSS(context, output);
    
                context.firstSelector = false;
                for (j = 1; j < pathSubCnt; j++) {
                    path[j].genCSS(context, output);
                }
            }
    
            output.add((context.compress ? '{' : ' {\n') + tabRuleStr);
        }
    
        // Compile rules and rulesets
        for (i = 0; (rule = ruleNodes[i]); i++) {
    
            if (i + 1 === ruleNodes.length) {
                context.lastRule = true;
            }
    
            var currentLastRule = context.lastRule;
            if (rule.isRulesetLike(rule)) {
                context.lastRule = false;
            }
    
            if (rule.genCSS) {
                rule.genCSS(context, output);
            } else if (rule.value) {
                output.add(rule.value.toString());
            }
    
            context.lastRule = currentLastRule;
    
            if (!context.lastRule && rule.isVisible()) {
                output.add(context.compress ? '' : ('\n' + tabRuleStr));
            } else {
                context.lastRule = false;
            }
        }
    
        if (!this.root) {
            output.add((context.compress ? '}' : '\n' + tabSetStr + '}'));
            context.tabLevel--;
        }
    
        if (!output.isEmpty() && !context.compress && this.firstRoot) {
            output.add('\n');
        }
    };
    
    Ruleset.prototype.joinSelectors = function (paths, context, selectors) {
        for (var s = 0; s < selectors.length; s++) {
            this.joinSelector(paths, context, selectors[s]);
        }
    };
    
    Ruleset.prototype.joinSelector = function (paths, context, selector) {
    
        function createParenthesis(elementsToPak, originalElement) {
            var replacementParen, j;
            if (elementsToPak.length === 0) {
                replacementParen = new Paren(elementsToPak[0]);
            } else {
                var insideParent = new Array(elementsToPak.length);
                for (j = 0; j < elementsToPak.length; j++) {
                    insideParent[j] = new Element(
                        null,
                        elementsToPak[j],
                        originalElement.isVariable,
                        originalElement._index,
                        originalElement._fileInfo
                    );
                }
                replacementParen = new Paren(new Selector(insideParent));
            }
            return replacementParen;
        }
    
        function createSelector(containedElement, originalElement) {
            var element, selector;
            element = new Element(null, containedElement, originalElement.isVariable, originalElement._index, originalElement._fileInfo);
            selector = new Selector([element]);
            return selector;
        }
    
        // joins selector path from `beginningPath` with selector path in `addPath`
        // `replacedElement` contains element that is being replaced by `addPath`
        // returns concatenated path
        function addReplacementIntoPath(beginningPath, addPath, replacedElement, originalSelector) {
            var newSelectorPath, lastSelector, newJoinedSelector;
            // our new selector path
            newSelectorPath = [];
    
            // construct the joined selector - if & is the first thing this will be empty,
            // if not newJoinedSelector will be the last set of elements in the selector
            if (beginningPath.length > 0) {
                newSelectorPath = utils.copyArray(beginningPath);
                lastSelector = newSelectorPath.pop();
                newJoinedSelector = originalSelector.createDerived(utils.copyArray(lastSelector.elements));
            }
            else {
                newJoinedSelector = originalSelector.createDerived([]);
            }
    
            if (addPath.length > 0) {
                // /deep/ is a CSS4 selector - (removed, so should deprecate)
                // that is valid without anything in front of it
                // so if the & does not have a combinator that is "" or " " then
                // and there is a combinator on the parent, then grab that.
                // this also allows + a { & .b { .a & { ... though not sure why you would want to do that
                var combinator = replacedElement.combinator, parentEl = addPath[0].elements[0];
                if (combinator.emptyOrWhitespace && !parentEl.combinator.emptyOrWhitespace) {
                    combinator = parentEl.combinator;
                }
                // join the elements so far with the first part of the parent
                newJoinedSelector.elements.push(new Element(
                    combinator,
                    parentEl.value,
                    replacedElement.isVariable,
                    replacedElement._index,
                    replacedElement._fileInfo
                ));
                newJoinedSelector.elements = newJoinedSelector.elements.concat(addPath[0].elements.slice(1));
            }
    
            // now add the joined selector - but only if it is not empty
            if (newJoinedSelector.elements.length !== 0) {
                newSelectorPath.push(newJoinedSelector);
            }
    
            // put together the parent selectors after the join (e.g. the rest of the parent)
            if (addPath.length > 1) {
                var restOfPath = addPath.slice(1);
                restOfPath = restOfPath.map(function (selector) {
                    return selector.createDerived(selector.elements, []);
                });
                newSelectorPath = newSelectorPath.concat(restOfPath);
            }
            return newSelectorPath;
        }
    
        // joins selector path from `beginningPath` with every selector path in `addPaths` array
        // `replacedElement` contains element that is being replaced by `addPath`
        // returns array with all concatenated paths
        function addAllReplacementsIntoPath( beginningPath, addPaths, replacedElement, originalSelector, result) {
            var j;
            for (j = 0; j < beginningPath.length; j++) {
                var newSelectorPath = addReplacementIntoPath(beginningPath[j], addPaths, replacedElement, originalSelector);
                result.push(newSelectorPath);
            }
            return result;
        }
    
        function mergeElementsOnToSelectors(elements, selectors) {
            var i, sel;
    
            if (elements.length === 0) {
                return ;
            }
            if (selectors.length === 0) {
                selectors.push([ new Selector(elements) ]);
                return;
            }
    
            for (i = 0; (sel = selectors[i]); i++) {
                // if the previous thing in sel is a parent this needs to join on to it
                if (sel.length > 0) {
                    sel[sel.length - 1] = sel[sel.length - 1].createDerived(sel[sel.length - 1].elements.concat(elements));
                }
                else {
                    sel.push(new Selector(elements));
                }
            }
        }
    
        // replace all parent selectors inside `inSelector` by content of `context` array
        // resulting selectors are returned inside `paths` array
        // returns true if `inSelector` contained at least one parent selector
        function replaceParentSelector(paths, context, inSelector) {
            // The paths are [[Selector]]
            // The first list is a list of comma separated selectors
            // The inner list is a list of inheritance separated selectors
            // e.g.
            // .a, .b {
            //   .c {
            //   }
            // }
            // == [[.a] [.c]] [[.b] [.c]]
            //
            var i, j, k, currentElements, newSelectors, selectorsMultiplied, sel, el, hadParentSelector = false, length, lastSelector;
            function findNestedSelector(element) {
                var maybeSelector;
                if (!(element.value instanceof Paren)) {
                    return null;
                }
    
                maybeSelector = element.value.value;
                if (!(maybeSelector instanceof Selector)) {
                    return null;
                }
    
                return maybeSelector;
            }
    
            // the elements from the current selector so far
            currentElements = [];
            // the current list of new selectors to add to the path.
            // We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
            // by the parents
            newSelectors = [
                []
            ];
    
            for (i = 0; (el = inSelector.elements[i]); i++) {
                // non parent reference elements just get added
                if (el.value !== '&') {
                    var nestedSelector = findNestedSelector(el);
                    if (nestedSelector != null) {
                        // merge the current list of non parent selector elements
                        // on to the current list of selectors to add
                        mergeElementsOnToSelectors(currentElements, newSelectors);
    
                        var nestedPaths = [], replaced, replacedNewSelectors = [];
                        replaced = replaceParentSelector(nestedPaths, context, nestedSelector);
                        hadParentSelector = hadParentSelector || replaced;
                        // the nestedPaths array should have only one member - replaceParentSelector does not multiply selectors
                        for (k = 0; k < nestedPaths.length; k++) {
                            var replacementSelector = createSelector(createParenthesis(nestedPaths[k], el), el);
                            addAllReplacementsIntoPath(newSelectors, [replacementSelector], el, inSelector, replacedNewSelectors);
                        }
                        newSelectors = replacedNewSelectors;
                        currentElements = [];
    
                    } else {
                        currentElements.push(el);
                    }
    
                } else {
                    hadParentSelector = true;
                    // the new list of selectors to add
                    selectorsMultiplied = [];
    
                    // merge the current list of non parent selector elements
                    // on to the current list of selectors to add
                    mergeElementsOnToSelectors(currentElements, newSelectors);
    
                    // loop through our current selectors
                    for (j = 0; j < newSelectors.length; j++) {
                        sel = newSelectors[j];
                        // if we don't have any parent paths, the & might be in a mixin so that it can be used
                        // whether there are parents or not
                        if (context.length === 0) {
                            // the combinator used on el should now be applied to the next element instead so that
                            // it is not lost
                            if (sel.length > 0) {
                                sel[0].elements.push(new Element(el.combinator, '', el.isVariable, el._index, el._fileInfo));
                            }
                            selectorsMultiplied.push(sel);
                        }
                        else {
                            // and the parent selectors
                            for (k = 0; k < context.length; k++) {
                                // We need to put the current selectors
                                // then join the last selector's elements on to the parents selectors
                                var newSelectorPath = addReplacementIntoPath(sel, context[k], el, inSelector);
                                // add that to our new set of selectors
                                selectorsMultiplied.push(newSelectorPath);
                            }
                        }
                    }
    
                    // our new selectors has been multiplied, so reset the state
                    newSelectors = selectorsMultiplied;
                    currentElements = [];
                }
            }
    
            // if we have any elements left over (e.g. .a& .b == .b)
            // add them on to all the current selectors
            mergeElementsOnToSelectors(currentElements, newSelectors);
    
            for (i = 0; i < newSelectors.length; i++) {
                length = newSelectors[i].length;
                if (length > 0) {
                    paths.push(newSelectors[i]);
                    lastSelector = newSelectors[i][length - 1];
                    newSelectors[i][length - 1] = lastSelector.createDerived(lastSelector.elements, inSelector.extendList);
                }
            }
    
            return hadParentSelector;
        }
    
        function deriveSelector(visibilityInfo, deriveFrom) {
            var newSelector = deriveFrom.createDerived(deriveFrom.elements, deriveFrom.extendList, deriveFrom.evaldCondition);
            newSelector.copyVisibilityInfo(visibilityInfo);
            return newSelector;
        }
    
        // joinSelector code follows
        var i, newPaths, hadParentSelector;
    
        newPaths = [];
        hadParentSelector = replaceParentSelector(newPaths, context, selector);
    
        if (!hadParentSelector) {
            if (context.length > 0) {
                newPaths = [];
                for (i = 0; i < context.length; i++) {
    
                    var concatenated = context[i].map(deriveSelector.bind(this, selector.visibilityInfo()));
    
                    concatenated.push(selector);
                    newPaths.push(concatenated);
                }
            }
            else {
                newPaths = [[selector]];
            }
        }
    
        for (i = 0; i < newPaths.length; i++) {
            paths.push(newPaths[i]);
        }
    
    };
    module.exports = Ruleset;
    
    },{"../contexts":13,"../functions/default":25,"../functions/function-registry":27,"../utils":89,"./anonymous":50,"./comment":57,"./debug-info":59,"./declaration":60,"./element":63,"./keyword":70,"./node":76,"./paren":78,"./selector":82}],82:[function(require,module,exports){
    var Node = require('./node'),
        Element = require('./element'),
        LessError = require('../less-error');
    
    var Selector = function (elements, extendList, condition, index, currentFileInfo, visibilityInfo) {
        this.extendList = extendList;
        this.condition = condition;
        this.evaldCondition = !condition;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.elements = this.getElements(elements);
        this.mixinElements_ = undefined;
        this.copyVisibilityInfo(visibilityInfo);
        this.setParent(this.elements, this);
    };
    Selector.prototype = new Node();
    Selector.prototype.type = 'Selector';
    Selector.prototype.accept = function (visitor) {
        if (this.elements) {
            this.elements = visitor.visitArray(this.elements);
        }
        if (this.extendList) {
            this.extendList = visitor.visitArray(this.extendList);
        }
        if (this.condition) {
            this.condition = visitor.visit(this.condition);
        }
    };
    Selector.prototype.createDerived = function(elements, extendList, evaldCondition) {
        elements = this.getElements(elements);
        var newSelector = new Selector(elements, extendList || this.extendList,
            null, this.getIndex(), this.fileInfo(), this.visibilityInfo());
        newSelector.evaldCondition = (evaldCondition != null) ? evaldCondition : this.evaldCondition;
        newSelector.mediaEmpty = this.mediaEmpty;
        return newSelector;
    };
    Selector.prototype.getElements = function(els) {
        if (!els) {
            return [new Element('', '&', false, this._index, this._fileInfo)];
        }
        if (typeof els === 'string') {
            this.parse.parseNode(
                els, 
                ['selector'],
                this._index, 
                this._fileInfo, 
                function(err, result) {
                    if (err) {
                        throw new LessError({
                            index: err.index,
                            message: err.message
                        }, this.parse.imports, this._fileInfo.filename);
                    }
                    els = result[0].elements;
                });
        }
        return els;
    };
    Selector.prototype.createEmptySelectors = function() {
        var el = new Element('', '&', false, this._index, this._fileInfo),
            sels = [new Selector([el], null, null, this._index, this._fileInfo)];
        sels[0].mediaEmpty = true;
        return sels;
    };
    Selector.prototype.match = function (other) {
        var elements = this.elements,
            len = elements.length,
            olen, i;
    
        other = other.mixinElements();
        olen = other.length;
        if (olen === 0 || len < olen) {
            return 0;
        } else {
            for (i = 0; i < olen; i++) {
                if (elements[i].value !== other[i]) {
                    return 0;
                }
            }
        }
    
        return olen; // return number of matched elements
    };
    Selector.prototype.mixinElements = function() {
        if (this.mixinElements_) {
            return this.mixinElements_;
        }
    
        var elements = this.elements.map( function(v) {
            return v.combinator.value + (v.value.value || v.value);
        }).join('').match(/[,&#\*\.\w-]([\w-]|(\\.))*/g);
    
        if (elements) {
            if (elements[0] === '&') {
                elements.shift();
            }
        } else {
            elements = [];
        }
    
        return (this.mixinElements_ = elements);
    };
    Selector.prototype.isJustParentSelector = function() {
        return !this.mediaEmpty &&
            this.elements.length === 1 &&
            this.elements[0].value === '&' &&
            (this.elements[0].combinator.value === ' ' || this.elements[0].combinator.value === '');
    };
    Selector.prototype.eval = function (context) {
        var evaldCondition = this.condition && this.condition.eval(context),
            elements = this.elements, extendList = this.extendList;
    
        elements = elements && elements.map(function (e) { return e.eval(context); });
        extendList = extendList && extendList.map(function(extend) { return extend.eval(context); });
    
        return this.createDerived(elements, extendList, evaldCondition);
    };
    Selector.prototype.genCSS = function (context, output) {
        var i, element;
        if ((!context || !context.firstSelector) && this.elements[0].combinator.value === '') {
            output.add(' ', this.fileInfo(), this.getIndex());
        }
        for (i = 0; i < this.elements.length; i++) {
            element = this.elements[i];
            element.genCSS(context, output);
        }
    };
    Selector.prototype.getIsOutput = function() {
        return this.evaldCondition;
    };
    module.exports = Selector;
    
    },{"../less-error":38,"./element":63,"./node":76}],83:[function(require,module,exports){
    var Node = require('./node');
    
    var UnicodeDescriptor = function (value) {
        this.value = value;
    };
    UnicodeDescriptor.prototype = new Node();
    UnicodeDescriptor.prototype.type = 'UnicodeDescriptor';
    
    module.exports = UnicodeDescriptor;
    
    },{"./node":76}],84:[function(require,module,exports){
    var Node = require('./node'),
        unitConversions = require('../data/unit-conversions'),
        utils = require('../utils');
    
    var Unit = function (numerator, denominator, backupUnit) {
        this.numerator = numerator ? utils.copyArray(numerator).sort() : [];
        this.denominator = denominator ? utils.copyArray(denominator).sort() : [];
        if (backupUnit) {
            this.backupUnit = backupUnit;
        } else if (numerator && numerator.length) {
            this.backupUnit = numerator[0];
        }
    };
    
    Unit.prototype = new Node();
    Unit.prototype.type = 'Unit';
    Unit.prototype.clone = function () {
        return new Unit(utils.copyArray(this.numerator), utils.copyArray(this.denominator), this.backupUnit);
    };
    Unit.prototype.genCSS = function (context, output) {
        // Dimension checks the unit is singular and throws an error if in strict math mode.
        var strictUnits = context && context.strictUnits;
        if (this.numerator.length === 1) {
            output.add(this.numerator[0]); // the ideal situation
        } else if (!strictUnits && this.backupUnit) {
            output.add(this.backupUnit);
        } else if (!strictUnits && this.denominator.length) {
            output.add(this.denominator[0]);
        }
    };
    Unit.prototype.toString = function () {
        var i, returnStr = this.numerator.join('*');
        for (i = 0; i < this.denominator.length; i++) {
            returnStr += '/' + this.denominator[i];
        }
        return returnStr;
    };
    Unit.prototype.compare = function (other) {
        return this.is(other.toString()) ? 0 : undefined;
    };
    Unit.prototype.is = function (unitString) {
        return this.toString().toUpperCase() === unitString.toUpperCase();
    };
    Unit.prototype.isLength = function () {
        return RegExp('^(px|em|ex|ch|rem|in|cm|mm|pc|pt|ex|vw|vh|vmin|vmax)$', 'gi').test(this.toCSS());
    };
    Unit.prototype.isEmpty = function () {
        return this.numerator.length === 0 && this.denominator.length === 0;
    };
    Unit.prototype.isSingular = function() {
        return this.numerator.length <= 1 && this.denominator.length === 0;
    };
    Unit.prototype.map = function(callback) {
        var i;
    
        for (i = 0; i < this.numerator.length; i++) {
            this.numerator[i] = callback(this.numerator[i], false);
        }
    
        for (i = 0; i < this.denominator.length; i++) {
            this.denominator[i] = callback(this.denominator[i], true);
        }
    };
    Unit.prototype.usedUnits = function() {
        var group, result = {}, mapUnit, groupName;
    
        mapUnit = function (atomicUnit) {
            /* jshint loopfunc:true */
            if (group.hasOwnProperty(atomicUnit) && !result[groupName]) {
                result[groupName] = atomicUnit;
            }
    
            return atomicUnit;
        };
    
        for (groupName in unitConversions) {
            if (unitConversions.hasOwnProperty(groupName)) {
                group = unitConversions[groupName];
    
                this.map(mapUnit);
            }
        }
    
        return result;
    };
    Unit.prototype.cancel = function () {
        var counter = {}, atomicUnit, i;
    
        for (i = 0; i < this.numerator.length; i++) {
            atomicUnit = this.numerator[i];
            counter[atomicUnit] = (counter[atomicUnit] || 0) + 1;
        }
    
        for (i = 0; i < this.denominator.length; i++) {
            atomicUnit = this.denominator[i];
            counter[atomicUnit] = (counter[atomicUnit] || 0) - 1;
        }
    
        this.numerator = [];
        this.denominator = [];
    
        for (atomicUnit in counter) {
            if (counter.hasOwnProperty(atomicUnit)) {
                var count = counter[atomicUnit];
    
                if (count > 0) {
                    for (i = 0; i < count; i++) {
                        this.numerator.push(atomicUnit);
                    }
                } else if (count < 0) {
                    for (i = 0; i < -count; i++) {
                        this.denominator.push(atomicUnit);
                    }
                }
            }
        }
    
        this.numerator.sort();
        this.denominator.sort();
    };
    module.exports = Unit;
    
    },{"../data/unit-conversions":16,"../utils":89,"./node":76}],85:[function(require,module,exports){
    var Node = require('./node');
    
    var URL = function (val, index, currentFileInfo, isEvald) {
        this.value = val;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.isEvald = isEvald;
    };
    URL.prototype = new Node();
    URL.prototype.type = 'Url';
    URL.prototype.accept = function (visitor) {
        this.value = visitor.visit(this.value);
    };
    URL.prototype.genCSS = function (context, output) {
        output.add('url(');
        this.value.genCSS(context, output);
        output.add(')');
    };
    URL.prototype.eval = function (context) {
        var val = this.value.eval(context),
            rootpath;
    
        if (!this.isEvald) {
            // Add the rootpath if the URL requires a rewrite
            rootpath = this.fileInfo() && this.fileInfo().rootpath;
            if (typeof rootpath === 'string' &&
                typeof val.value === 'string' &&
                context.pathRequiresRewrite(val.value)) {
                if (!val.quote) {
                    rootpath = escapePath(rootpath);
                }
                val.value = context.rewritePath(val.value, rootpath);
            } else {
                val.value = context.normalizePath(val.value);
            }
    
            // Add url args if enabled
            if (context.urlArgs) {
                if (!val.value.match(/^\s*data:/)) {
                    var delimiter = val.value.indexOf('?') === -1 ? '?' : '&';
                    var urlArgs = delimiter + context.urlArgs;
                    if (val.value.indexOf('#') !== -1) {
                        val.value = val.value.replace('#', urlArgs + '#');
                    } else {
                        val.value += urlArgs;
                    }
                }
            }
        }
    
        return new URL(val, this.getIndex(), this.fileInfo(), true);
    };
    
    function escapePath(path) {
        return path.replace(/[\(\)'"\s]/g, function(match) { return '\\' + match; });
    }
    
    module.exports = URL;
    
    },{"./node":76}],86:[function(require,module,exports){
    var Node = require('./node');
    
    var Value = function (value) {
        if (!value) {
            throw new Error('Value requires an array argument');
        }
        if (!Array.isArray(value)) {
            this.value = [ value ];
        }
        else {
            this.value = value;
        }
    };
    Value.prototype = new Node();
    Value.prototype.type = 'Value';
    Value.prototype.accept = function (visitor) {
        if (this.value) {
            this.value = visitor.visitArray(this.value);
        }
    };
    Value.prototype.eval = function (context) {
        if (this.value.length === 1) {
            return this.value[0].eval(context);
        } else {
            return new Value(this.value.map(function (v) {
                return v.eval(context);
            }));
        }
    };
    Value.prototype.genCSS = function (context, output) {
        var i;
        for (i = 0; i < this.value.length; i++) {
            this.value[i].genCSS(context, output);
            if (i + 1 < this.value.length) {
                output.add((context && context.compress) ? ',' : ', ');
            }
        }
    };
    module.exports = Value;
    
    },{"./node":76}],87:[function(require,module,exports){
    var Node = require('./node'),
        Variable = require('./variable'),
        Ruleset = require('./ruleset'),
        DetachedRuleset = require('./detached-ruleset'),
        LessError = require('../less-error');
    
    var VariableCall = function (variable, index, currentFileInfo) {
        this.variable = variable;
        this._index = index;
        this._fileInfo = currentFileInfo;
        this.allowRoot = true;
    };
    VariableCall.prototype = new Node();
    VariableCall.prototype.type = 'VariableCall';
    VariableCall.prototype.eval = function (context) {
        var rules, detachedRuleset = new Variable(this.variable, this.getIndex(), this.fileInfo()).eval(context),
            error = new LessError({message: 'Could not evaluate variable call ' + this.variable});
    
        if (!detachedRuleset.ruleset) {
            if (detachedRuleset.rules) {
                rules = detachedRuleset;
            }
            else if (Array.isArray(detachedRuleset)) {
                rules = new Ruleset('', detachedRuleset);
            }
            else if (Array.isArray(detachedRuleset.value)) {
                rules = new Ruleset('', detachedRuleset.value);
            }
            else {
                throw error;
            }
            detachedRuleset = new DetachedRuleset(rules);
        }
        if (detachedRuleset.ruleset) {
            return detachedRuleset.callEval(context);
        }
        throw error;
    };
    module.exports = VariableCall;
    
    },{"../less-error":38,"./detached-ruleset":61,"./node":76,"./ruleset":81,"./variable":88}],88:[function(require,module,exports){
    var Node = require('./node'),
        Call = require('./call');
    
    var Variable = function (name, index, currentFileInfo) {
        this.name = name;
        this._index = index;
        this._fileInfo = currentFileInfo;
    };
    Variable.prototype = new Node();
    Variable.prototype.type = 'Variable';
    Variable.prototype.eval = function (context) {
        var variable, name = this.name;
    
        if (name.indexOf('@@') === 0) {
            name = '@' + new Variable(name.slice(1), this.getIndex(), this.fileInfo()).eval(context).value;
        }
    
        if (this.evaluating) {
            throw { type: 'Name',
                message: 'Recursive variable definition for ' + name,
                filename: this.fileInfo().filename,
                index: this.getIndex() };
        }
    
        this.evaluating = true;
    
        variable = this.find(context.frames, function (frame) {
            var v = frame.variable(name);
            if (v) {
                if (v.important) {
                    var importantScope = context.importantScope[context.importantScope.length - 1];
                    importantScope.important = v.important;
                }
                // If in calc, wrap vars in a function call to cascade evaluate args first
                if (context.inCalc) {
                    return (new Call('_SELF', [v.value])).eval(context);
                }
                else {
                    return v.value.eval(context);
                }
            }
        });
        if (variable) {
            this.evaluating = false;
            return variable;
        } else {
            throw { type: 'Name',
                message: 'variable ' + name + ' is undefined',
                filename: this.fileInfo().filename,
                index: this.getIndex() };
        }
    };
    Variable.prototype.find = function (obj, fun) {
        for (var i = 0, r; i < obj.length; i++) {
            r = fun.call(obj, obj[i]);
            if (r) { return r; }
        }
        return null;
    };
    module.exports = Variable;
    
    },{"./call":54,"./node":76}],89:[function(require,module,exports){
    /* jshint proto: true */
    var Constants = require('./constants');
    var clone = require('clone');
    
    var utils = {
        getLocation: function(index, inputStream) {
            var n = index + 1,
                line = null,
                column = -1;
    
            while (--n >= 0 && inputStream.charAt(n) !== '\n') {
                column++;
            }
    
            if (typeof index === 'number') {
                line = (inputStream.slice(0, index).match(/\n/g) || '').length;
            }
    
            return {
                line: line,
                column: column
            };
        },
        copyArray: function(arr) {
            var i, length = arr.length,
                copy = new Array(length);
            
            for (i = 0; i < length; i++) {
                copy[i] = arr[i];
            }
            return copy;
        },
        clone: function (obj) {
            var cloned = {};
            for (var prop in obj) {
                if (obj.hasOwnProperty(prop)) {
                    cloned[prop] = obj[prop];
                }
            }
            return cloned;
        },
        copyOptions: function(obj1, obj2) {
            if (obj2 && obj2._defaults) {
                return obj2;
            }
            var opts = utils.defaults(obj1, obj2);
            if (opts.strictMath) {
                opts.math = Constants.Math.STRICT_LEGACY;
            }
            // Back compat with changed relativeUrls option
            if (opts.relativeUrls) {
                opts.rewriteUrls = Constants.RewriteUrls.ALL;
            }
            if (typeof opts.math === 'string') {
                switch (opts.math.toLowerCase()) {
                    case 'always':
                        opts.math = Constants.Math.ALWAYS;
                        break;
                    case 'parens-division':
                        opts.math = Constants.Math.PARENS_DIVISION;
                        break;
                    case 'strict':
                    case 'parens':
                        opts.math = Constants.Math.PARENS;
                        break;
                    case 'strict-legacy':
                        opts.math = Constants.Math.STRICT_LEGACY;
                }
            }
            if (typeof opts.rewriteUrls === 'string') {
                switch (opts.rewriteUrls.toLowerCase()) {
                    case 'off':
                        opts.rewriteUrls = Constants.RewriteUrls.OFF;
                        break;
                    case 'local':
                        opts.rewriteUrls = Constants.RewriteUrls.LOCAL;
                        break;
                    case 'all':
                        opts.rewriteUrls = Constants.RewriteUrls.ALL;
                        break;
                }
            }
            return opts;
        },
        defaults: function(obj1, obj2) {
            var newObj = obj2 || {};
            if (!obj2._defaults) {
                newObj = {};
                var defaults = clone(obj1);
                newObj._defaults = defaults;
                var cloned = obj2 ? clone(obj2) : {};
                Object.assign(newObj, defaults, cloned);
            }
            return newObj;
        },
        merge: function(obj1, obj2) {
            for (var prop in obj2) {
                if (obj2.hasOwnProperty(prop)) {
                    obj1[prop] = obj2[prop];
                }
            }
            return obj1;
        },
        flattenArray: function(arr, result) {
            result = result || [];
            for (var i = 0, length = arr.length; i < length; i++) {
                var value = arr[i];
                if (Array.isArray(value)) {
                    utils.flattenArray(value, result);
                } else {
                    if (value !== undefined) {
                        result.push(value);
                    }
                }
            }
            return result;
        }
    };
    
    module.exports = utils;
    },{"./constants":12,"clone":100}],90:[function(require,module,exports){
    var tree = require('../tree'),
        Visitor = require('./visitor'),
        logger = require('../logger'),
        utils = require('../utils');
    
    /* jshint loopfunc:true */
    
    var ExtendFinderVisitor = function() {
        this._visitor = new Visitor(this);
        this.contexts = [];
        this.allExtendsStack = [[]];
    };
    
    ExtendFinderVisitor.prototype = {
        run: function (root) {
            root = this._visitor.visit(root);
            root.allExtends = this.allExtendsStack[0];
            return root;
        },
        visitDeclaration: function (declNode, visitArgs) {
            visitArgs.visitDeeper = false;
        },
        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
            visitArgs.visitDeeper = false;
        },
        visitRuleset: function (rulesetNode, visitArgs) {
            if (rulesetNode.root) {
                return;
            }
    
            var i, j, extend, allSelectorsExtendList = [], extendList;
    
            // get &:extend(.a); rules which apply to all selectors in this ruleset
            var rules = rulesetNode.rules, ruleCnt = rules ? rules.length : 0;
            for (i = 0; i < ruleCnt; i++) {
                if (rulesetNode.rules[i] instanceof tree.Extend) {
                    allSelectorsExtendList.push(rules[i]);
                    rulesetNode.extendOnEveryPath = true;
                }
            }
    
            // now find every selector and apply the extends that apply to all extends
            // and the ones which apply to an individual extend
            var paths = rulesetNode.paths;
            for (i = 0; i < paths.length; i++) {
                var selectorPath = paths[i],
                    selector = selectorPath[selectorPath.length - 1],
                    selExtendList = selector.extendList;
    
                extendList = selExtendList ? utils.copyArray(selExtendList).concat(allSelectorsExtendList)
                                           : allSelectorsExtendList;
    
                if (extendList) {
                    extendList = extendList.map(function(allSelectorsExtend) {
                        return allSelectorsExtend.clone();
                    });
                }
    
                for (j = 0; j < extendList.length; j++) {
                    this.foundExtends = true;
                    extend = extendList[j];
                    extend.findSelfSelectors(selectorPath);
                    extend.ruleset = rulesetNode;
                    if (j === 0) { extend.firstExtendOnThisSelectorPath = true; }
                    this.allExtendsStack[this.allExtendsStack.length - 1].push(extend);
                }
            }
    
            this.contexts.push(rulesetNode.selectors);
        },
        visitRulesetOut: function (rulesetNode) {
            if (!rulesetNode.root) {
                this.contexts.length = this.contexts.length - 1;
            }
        },
        visitMedia: function (mediaNode, visitArgs) {
            mediaNode.allExtends = [];
            this.allExtendsStack.push(mediaNode.allExtends);
        },
        visitMediaOut: function (mediaNode) {
            this.allExtendsStack.length = this.allExtendsStack.length - 1;
        },
        visitAtRule: function (atRuleNode, visitArgs) {
            atRuleNode.allExtends = [];
            this.allExtendsStack.push(atRuleNode.allExtends);
        },
        visitAtRuleOut: function (atRuleNode) {
            this.allExtendsStack.length = this.allExtendsStack.length - 1;
        }
    };
    
    var ProcessExtendsVisitor = function() {
        this._visitor = new Visitor(this);
    };
    
    ProcessExtendsVisitor.prototype = {
        run: function(root) {
            var extendFinder = new ExtendFinderVisitor();
            this.extendIndices = {};
            extendFinder.run(root);
            if (!extendFinder.foundExtends) { return root; }
            root.allExtends = root.allExtends.concat(this.doExtendChaining(root.allExtends, root.allExtends));
            this.allExtendsStack = [root.allExtends];
            var newRoot = this._visitor.visit(root);
            this.checkExtendsForNonMatched(root.allExtends);
            return newRoot;
        },
        checkExtendsForNonMatched: function(extendList) {
            var indices = this.extendIndices;
            extendList.filter(function(extend) {
                return !extend.hasFoundMatches && extend.parent_ids.length == 1;
            }).forEach(function(extend) {
                var selector = '_unknown_';
                try {
                    selector = extend.selector.toCSS({});
                }
                catch (_) {}
    
                if (!indices[extend.index + ' ' + selector]) {
                    indices[extend.index + ' ' + selector] = true;
                    logger.warn('extend \'' + selector + '\' has no matches');
                }
            });
        },
        doExtendChaining: function (extendsList, extendsListTarget, iterationCount) {
            //
            // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering
            // and pasting the selector we would do normally, but we are also adding an extend with the same target selector
            // this means this new extend can then go and alter other extends
            //
            // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors
            // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already
            // processed if we look at each selector at a time, as is done in visitRuleset
    
            var extendIndex, targetExtendIndex, matches, extendsToAdd = [], newSelector, extendVisitor = this, selectorPath,
                extend, targetExtend, newExtend;
    
            iterationCount = iterationCount || 0;
    
            // loop through comparing every extend with every target extend.
            // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place
            // e.g.  .a:extend(.b) {}  and .b:extend(.c) {} then the first extend extends the second one
            // and the second is the target.
            // the separation into two lists allows us to process a subset of chains with a bigger set, as is the
            // case when processing media queries
            for (extendIndex = 0; extendIndex < extendsList.length; extendIndex++) {
                for (targetExtendIndex = 0; targetExtendIndex < extendsListTarget.length; targetExtendIndex++) {
    
                    extend = extendsList[extendIndex];
                    targetExtend = extendsListTarget[targetExtendIndex];
    
                    // look for circular references
                    if ( extend.parent_ids.indexOf( targetExtend.object_id ) >= 0 ) { continue; }
    
                    // find a match in the target extends self selector (the bit before :extend)
                    selectorPath = [targetExtend.selfSelectors[0]];
                    matches = extendVisitor.findMatch(extend, selectorPath);
    
                    if (matches.length) {
                        extend.hasFoundMatches = true;
    
                        // we found a match, so for each self selector..
                        extend.selfSelectors.forEach(function(selfSelector) {
                            var info = targetExtend.visibilityInfo();
    
                            // process the extend as usual
                            newSelector = extendVisitor.extendSelector(matches, selectorPath, selfSelector, extend.isVisible());
    
                            // but now we create a new extend from it
                            newExtend = new(tree.Extend)(targetExtend.selector, targetExtend.option, 0, targetExtend.fileInfo(), info);
                            newExtend.selfSelectors = newSelector;
    
                            // add the extend onto the list of extends for that selector
                            newSelector[newSelector.length - 1].extendList = [newExtend];
    
                            // record that we need to add it.
                            extendsToAdd.push(newExtend);
                            newExtend.ruleset = targetExtend.ruleset;
    
                            // remember its parents for circular references
                            newExtend.parent_ids = newExtend.parent_ids.concat(targetExtend.parent_ids, extend.parent_ids);
    
                            // only process the selector once.. if we have :extend(.a,.b) then multiple
                            // extends will look at the same selector path, so when extending
                            // we know that any others will be duplicates in terms of what is added to the css
                            if (targetExtend.firstExtendOnThisSelectorPath) {
                                newExtend.firstExtendOnThisSelectorPath = true;
                                targetExtend.ruleset.paths.push(newSelector);
                            }
                        });
                    }
                }
            }
    
            if (extendsToAdd.length) {
                // try to detect circular references to stop a stack overflow.
                // may no longer be needed.
                this.extendChainCount++;
                if (iterationCount > 100) {
                    var selectorOne = '{unable to calculate}';
                    var selectorTwo = '{unable to calculate}';
                    try {
                        selectorOne = extendsToAdd[0].selfSelectors[0].toCSS();
                        selectorTwo = extendsToAdd[0].selector.toCSS();
                    }
                    catch (e) {}
                    throw { message: 'extend circular reference detected. One of the circular extends is currently:' +
                        selectorOne + ':extend(' + selectorTwo + ')'};
                }
    
                // now process the new extends on the existing rules so that we can handle a extending b extending c extending
                // d extending e...
                return extendsToAdd.concat(extendVisitor.doExtendChaining(extendsToAdd, extendsListTarget, iterationCount + 1));
            } else {
                return extendsToAdd;
            }
        },
        visitDeclaration: function (ruleNode, visitArgs) {
            visitArgs.visitDeeper = false;
        },
        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
            visitArgs.visitDeeper = false;
        },
        visitSelector: function (selectorNode, visitArgs) {
            visitArgs.visitDeeper = false;
        },
        visitRuleset: function (rulesetNode, visitArgs) {
            if (rulesetNode.root) {
                return;
            }
            var matches, pathIndex, extendIndex, allExtends = this.allExtendsStack[this.allExtendsStack.length - 1],
                selectorsToAdd = [], extendVisitor = this, selectorPath;
    
            // look at each selector path in the ruleset, find any extend matches and then copy, find and replace
    
            for (extendIndex = 0; extendIndex < allExtends.length; extendIndex++) {
                for (pathIndex = 0; pathIndex < rulesetNode.paths.length; pathIndex++) {
                    selectorPath = rulesetNode.paths[pathIndex];
    
                    // extending extends happens initially, before the main pass
                    if (rulesetNode.extendOnEveryPath) { continue; }
                    var extendList = selectorPath[selectorPath.length - 1].extendList;
                    if (extendList && extendList.length) { continue; }
    
                    matches = this.findMatch(allExtends[extendIndex], selectorPath);
    
                    if (matches.length) {
                        allExtends[extendIndex].hasFoundMatches = true;
    
                        allExtends[extendIndex].selfSelectors.forEach(function(selfSelector) {
                            var extendedSelectors;
                            extendedSelectors = extendVisitor.extendSelector(matches, selectorPath, selfSelector, allExtends[extendIndex].isVisible());
                            selectorsToAdd.push(extendedSelectors);
                        });
                    }
                }
            }
            rulesetNode.paths = rulesetNode.paths.concat(selectorsToAdd);
        },
        findMatch: function (extend, haystackSelectorPath) {
            //
            // look through the haystack selector path to try and find the needle - extend.selector
            // returns an array of selector matches that can then be replaced
            //
            var haystackSelectorIndex, hackstackSelector, hackstackElementIndex, haystackElement,
                targetCombinator, i,
                extendVisitor = this,
                needleElements = extend.selector.elements,
                potentialMatches = [], potentialMatch, matches = [];
    
            // loop through the haystack elements
            for (haystackSelectorIndex = 0; haystackSelectorIndex < haystackSelectorPath.length; haystackSelectorIndex++) {
                hackstackSelector = haystackSelectorPath[haystackSelectorIndex];
    
                for (hackstackElementIndex = 0; hackstackElementIndex < hackstackSelector.elements.length; hackstackElementIndex++) {
    
                    haystackElement = hackstackSelector.elements[hackstackElementIndex];
    
                    // if we allow elements before our match we can add a potential match every time. otherwise only at the first element.
                    if (extend.allowBefore || (haystackSelectorIndex === 0 && hackstackElementIndex === 0)) {
                        potentialMatches.push({pathIndex: haystackSelectorIndex, index: hackstackElementIndex, matched: 0,
                            initialCombinator: haystackElement.combinator});
                    }
    
                    for (i = 0; i < potentialMatches.length; i++) {
                        potentialMatch = potentialMatches[i];
    
                        // selectors add " " onto the first element. When we use & it joins the selectors together, but if we don't
                        // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to
                        // work out what the resulting combinator will be
                        targetCombinator = haystackElement.combinator.value;
                        if (targetCombinator === '' && hackstackElementIndex === 0) {
                            targetCombinator = ' ';
                        }
    
                        // if we don't match, null our match to indicate failure
                        if (!extendVisitor.isElementValuesEqual(needleElements[potentialMatch.matched].value, haystackElement.value) ||
                            (potentialMatch.matched > 0 && needleElements[potentialMatch.matched].combinator.value !== targetCombinator)) {
                            potentialMatch = null;
                        } else {
                            potentialMatch.matched++;
                        }
    
                        // if we are still valid and have finished, test whether we have elements after and whether these are allowed
                        if (potentialMatch) {
                            potentialMatch.finished = potentialMatch.matched === needleElements.length;
                            if (potentialMatch.finished &&
                                (!extend.allowAfter &&
                                    (hackstackElementIndex + 1 < hackstackSelector.elements.length || haystackSelectorIndex + 1 < haystackSelectorPath.length))) {
                                potentialMatch = null;
                            }
                        }
                        // if null we remove, if not, we are still valid, so either push as a valid match or continue
                        if (potentialMatch) {
                            if (potentialMatch.finished) {
                                potentialMatch.length = needleElements.length;
                                potentialMatch.endPathIndex = haystackSelectorIndex;
                                potentialMatch.endPathElementIndex = hackstackElementIndex + 1; // index after end of match
                                potentialMatches.length = 0; // we don't allow matches to overlap, so start matching again
                                matches.push(potentialMatch);
                            }
                        } else {
                            potentialMatches.splice(i, 1);
                            i--;
                        }
                    }
                }
            }
            return matches;
        },
        isElementValuesEqual: function(elementValue1, elementValue2) {
            if (typeof elementValue1 === 'string' || typeof elementValue2 === 'string') {
                return elementValue1 === elementValue2;
            }
            if (elementValue1 instanceof tree.Attribute) {
                if (elementValue1.op !== elementValue2.op || elementValue1.key !== elementValue2.key) {
                    return false;
                }
                if (!elementValue1.value || !elementValue2.value) {
                    if (elementValue1.value || elementValue2.value) {
                        return false;
                    }
                    return true;
                }
                elementValue1 = elementValue1.value.value || elementValue1.value;
                elementValue2 = elementValue2.value.value || elementValue2.value;
                return elementValue1 === elementValue2;
            }
            elementValue1 = elementValue1.value;
            elementValue2 = elementValue2.value;
            if (elementValue1 instanceof tree.Selector) {
                if (!(elementValue2 instanceof tree.Selector) || elementValue1.elements.length !== elementValue2.elements.length) {
                    return false;
                }
                for (var i = 0; i  < elementValue1.elements.length; i++) {
                    if (elementValue1.elements[i].combinator.value !== elementValue2.elements[i].combinator.value) {
                        if (i !== 0 || (elementValue1.elements[i].combinator.value || ' ') !== (elementValue2.elements[i].combinator.value || ' ')) {
                            return false;
                        }
                    }
                    if (!this.isElementValuesEqual(elementValue1.elements[i].value, elementValue2.elements[i].value)) {
                        return false;
                    }
                }
                return true;
            }
            return false;
        },
        extendSelector:function (matches, selectorPath, replacementSelector, isVisible) {
    
            // for a set of matches, replace each match with the replacement selector
    
            var currentSelectorPathIndex = 0,
                currentSelectorPathElementIndex = 0,
                path = [],
                matchIndex,
                selector,
                firstElement,
                match,
                newElements;
    
            for (matchIndex = 0; matchIndex < matches.length; matchIndex++) {
                match = matches[matchIndex];
                selector = selectorPath[match.pathIndex];
                firstElement = new tree.Element(
                    match.initialCombinator,
                    replacementSelector.elements[0].value,
                    replacementSelector.elements[0].isVariable,
                    replacementSelector.elements[0].getIndex(),
                    replacementSelector.elements[0].fileInfo()
                );
    
                if (match.pathIndex > currentSelectorPathIndex && currentSelectorPathElementIndex > 0) {
                    path[path.length - 1].elements = path[path.length - 1]
                        .elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
                    currentSelectorPathElementIndex = 0;
                    currentSelectorPathIndex++;
                }
    
                newElements = selector.elements
                    .slice(currentSelectorPathElementIndex, match.index)
                    .concat([firstElement])
                    .concat(replacementSelector.elements.slice(1));
    
                if (currentSelectorPathIndex === match.pathIndex && matchIndex > 0) {
                    path[path.length - 1].elements =
                        path[path.length - 1].elements.concat(newElements);
                } else {
                    path = path.concat(selectorPath.slice(currentSelectorPathIndex, match.pathIndex));
    
                    path.push(new tree.Selector(
                        newElements
                    ));
                }
                currentSelectorPathIndex = match.endPathIndex;
                currentSelectorPathElementIndex = match.endPathElementIndex;
                if (currentSelectorPathElementIndex >= selectorPath[currentSelectorPathIndex].elements.length) {
                    currentSelectorPathElementIndex = 0;
                    currentSelectorPathIndex++;
                }
            }
    
            if (currentSelectorPathIndex < selectorPath.length && currentSelectorPathElementIndex > 0) {
                path[path.length - 1].elements = path[path.length - 1]
                    .elements.concat(selectorPath[currentSelectorPathIndex].elements.slice(currentSelectorPathElementIndex));
                currentSelectorPathIndex++;
            }
    
            path = path.concat(selectorPath.slice(currentSelectorPathIndex, selectorPath.length));
            path = path.map(function (currentValue) {
                // we can re-use elements here, because the visibility property matters only for selectors
                var derived = currentValue.createDerived(currentValue.elements);
                if (isVisible) {
                    derived.ensureVisibility();
                } else {
                    derived.ensureInvisibility();
                }
                return derived;
            });
            return path;
        },
        visitMedia: function (mediaNode, visitArgs) {
            var newAllExtends = mediaNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length - 1]);
            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, mediaNode.allExtends));
            this.allExtendsStack.push(newAllExtends);
        },
        visitMediaOut: function (mediaNode) {
            var lastIndex = this.allExtendsStack.length - 1;
            this.allExtendsStack.length = lastIndex;
        },
        visitAtRule: function (atRuleNode, visitArgs) {
            var newAllExtends = atRuleNode.allExtends.concat(this.allExtendsStack[this.allExtendsStack.length - 1]);
            newAllExtends = newAllExtends.concat(this.doExtendChaining(newAllExtends, atRuleNode.allExtends));
            this.allExtendsStack.push(newAllExtends);
        },
        visitAtRuleOut: function (atRuleNode) {
            var lastIndex = this.allExtendsStack.length - 1;
            this.allExtendsStack.length = lastIndex;
        }
    };
    
    module.exports = ProcessExtendsVisitor;
    
    },{"../logger":39,"../tree":67,"../utils":89,"./visitor":97}],91:[function(require,module,exports){
    function ImportSequencer(onSequencerEmpty) {
        this.imports = [];
        this.variableImports = [];
        this._onSequencerEmpty = onSequencerEmpty;
        this._currentDepth = 0;
    }
    
    ImportSequencer.prototype.addImport = function(callback) {
        var importSequencer = this,
            importItem = {
                callback: callback,
                args: null,
                isReady: false
            };
        this.imports.push(importItem);
        return function() {
            importItem.args = Array.prototype.slice.call(arguments, 0);
            importItem.isReady = true;
            importSequencer.tryRun();
        };
    };
    
    ImportSequencer.prototype.addVariableImport = function(callback) {
        this.variableImports.push(callback);
    };
    
    ImportSequencer.prototype.tryRun = function() {
        this._currentDepth++;
        try {
            while (true) {
                while (this.imports.length > 0) {
                    var importItem = this.imports[0];
                    if (!importItem.isReady) {
                        return;
                    }
                    this.imports = this.imports.slice(1);
                    importItem.callback.apply(null, importItem.args);
                }
                if (this.variableImports.length === 0) {
                    break;
                }
                var variableImport = this.variableImports[0];
                this.variableImports = this.variableImports.slice(1);
                variableImport();
            }
        } finally {
            this._currentDepth--;
        }
        if (this._currentDepth === 0 && this._onSequencerEmpty) {
            this._onSequencerEmpty();
        }
    };
    
    module.exports = ImportSequencer;
    
    },{}],92:[function(require,module,exports){
    var contexts = require('../contexts'),
        Visitor = require('./visitor'),
        ImportSequencer = require('./import-sequencer'),
        utils = require('../utils');
    
    var ImportVisitor = function(importer, finish) {
    
        this._visitor = new Visitor(this);
        this._importer = importer;
        this._finish = finish;
        this.context = new contexts.Eval();
        this.importCount = 0;
        this.onceFileDetectionMap = {};
        this.recursionDetector = {};
        this._sequencer = new ImportSequencer(this._onSequencerEmpty.bind(this));
    };
    
    ImportVisitor.prototype = {
        isReplacing: false,
        run: function (root) {
            try {
                // process the contents
                this._visitor.visit(root);
            }
            catch (e) {
                this.error = e;
            }
    
            this.isFinished = true;
            this._sequencer.tryRun();
        },
        _onSequencerEmpty: function() {
            if (!this.isFinished) {
                return;
            }
            this._finish(this.error);
        },
        visitImport: function (importNode, visitArgs) {
            var inlineCSS = importNode.options.inline;
    
            if (!importNode.css || inlineCSS) {
    
                var context = new contexts.Eval(this.context, utils.copyArray(this.context.frames));
                var importParent = context.frames[0];
    
                this.importCount++;
                if (importNode.isVariableImport()) {
                    this._sequencer.addVariableImport(this.processImportNode.bind(this, importNode, context, importParent));
                } else {
                    this.processImportNode(importNode, context, importParent);
                }
            }
            visitArgs.visitDeeper = false;
        },
        processImportNode: function(importNode, context, importParent) {
            var evaldImportNode,
                inlineCSS = importNode.options.inline;
    
            try {
                evaldImportNode = importNode.evalForImport(context);
            } catch (e) {
                if (!e.filename) { e.index = importNode.getIndex(); e.filename = importNode.fileInfo().filename; }
                // attempt to eval properly and treat as css
                importNode.css = true;
                // if that fails, this error will be thrown
                importNode.error = e;
            }
    
            if (evaldImportNode && (!evaldImportNode.css || inlineCSS)) {
    
                if (evaldImportNode.options.multiple) {
                    context.importMultiple = true;
                }
    
                // try appending if we haven't determined if it is css or not
                var tryAppendLessExtension = evaldImportNode.css === undefined;
    
                for (var i = 0; i < importParent.rules.length; i++) {
                    if (importParent.rules[i] === importNode) {
                        importParent.rules[i] = evaldImportNode;
                        break;
                    }
                }
    
                var onImported = this.onImported.bind(this, evaldImportNode, context),
                    sequencedOnImported = this._sequencer.addImport(onImported);
    
                this._importer.push(evaldImportNode.getPath(), tryAppendLessExtension, evaldImportNode.fileInfo(),
                    evaldImportNode.options, sequencedOnImported);
            } else {
                this.importCount--;
                if (this.isFinished) {
                    this._sequencer.tryRun();
                }
            }
        },
        onImported: function (importNode, context, e, root, importedAtRoot, fullPath) {
            if (e) {
                if (!e.filename) {
                    e.index = importNode.getIndex(); e.filename = importNode.fileInfo().filename;
                }
                this.error = e;
            }
    
            var importVisitor = this,
                inlineCSS = importNode.options.inline,
                isPlugin = importNode.options.isPlugin,
                isOptional = importNode.options.optional,
                duplicateImport = importedAtRoot || fullPath in importVisitor.recursionDetector;
    
            if (!context.importMultiple) {
                if (duplicateImport) {
                    importNode.skip = true;
                } else {
                    importNode.skip = function() {
                        if (fullPath in importVisitor.onceFileDetectionMap) {
                            return true;
                        }
                        importVisitor.onceFileDetectionMap[fullPath] = true;
                        return false;
                    };
                }
            }
    
            if (!fullPath && isOptional) {
                importNode.skip = true;
            }
    
            if (root) {
                importNode.root = root;
                importNode.importedFilename = fullPath;
    
                if (!inlineCSS && !isPlugin && (context.importMultiple || !duplicateImport)) {
                    importVisitor.recursionDetector[fullPath] = true;
    
                    var oldContext = this.context;
                    this.context = context;
                    try {
                        this._visitor.visit(root);
                    } catch (e) {
                        this.error = e;
                    }
                    this.context = oldContext;
                }
            }
    
            importVisitor.importCount--;
    
            if (importVisitor.isFinished) {
                importVisitor._sequencer.tryRun();
            }
        },
        visitDeclaration: function (declNode, visitArgs) {
            if (declNode.value.type === 'DetachedRuleset') {
                this.context.frames.unshift(declNode);
            } else {
                visitArgs.visitDeeper = false;
            }
        },
        visitDeclarationOut: function(declNode) {
            if (declNode.value.type === 'DetachedRuleset') {
                this.context.frames.shift();
            }
        },
        visitAtRule: function (atRuleNode, visitArgs) {
            this.context.frames.unshift(atRuleNode);
        },
        visitAtRuleOut: function (atRuleNode) {
            this.context.frames.shift();
        },
        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
            this.context.frames.unshift(mixinDefinitionNode);
        },
        visitMixinDefinitionOut: function (mixinDefinitionNode) {
            this.context.frames.shift();
        },
        visitRuleset: function (rulesetNode, visitArgs) {
            this.context.frames.unshift(rulesetNode);
        },
        visitRulesetOut: function (rulesetNode) {
            this.context.frames.shift();
        },
        visitMedia: function (mediaNode, visitArgs) {
            this.context.frames.unshift(mediaNode.rules[0]);
        },
        visitMediaOut: function (mediaNode) {
            this.context.frames.shift();
        }
    };
    module.exports = ImportVisitor;
    
    },{"../contexts":13,"../utils":89,"./import-sequencer":91,"./visitor":97}],93:[function(require,module,exports){
    var visitors = {
        Visitor: require('./visitor'),
        ImportVisitor: require('./import-visitor'),
        MarkVisibleSelectorsVisitor: require('./set-tree-visibility-visitor'),
        ExtendVisitor: require('./extend-visitor'),
        JoinSelectorVisitor: require('./join-selector-visitor'),
        ToCSSVisitor: require('./to-css-visitor')
    };
    
    module.exports = visitors;
    
    },{"./extend-visitor":90,"./import-visitor":92,"./join-selector-visitor":94,"./set-tree-visibility-visitor":95,"./to-css-visitor":96,"./visitor":97}],94:[function(require,module,exports){
    var Visitor = require('./visitor');
    
    var JoinSelectorVisitor = function() {
        this.contexts = [[]];
        this._visitor = new Visitor(this);
    };
    
    JoinSelectorVisitor.prototype = {
        run: function (root) {
            return this._visitor.visit(root);
        },
        visitDeclaration: function (declNode, visitArgs) {
            visitArgs.visitDeeper = false;
        },
        visitMixinDefinition: function (mixinDefinitionNode, visitArgs) {
            visitArgs.visitDeeper = false;
        },
    
        visitRuleset: function (rulesetNode, visitArgs) {
            var context = this.contexts[this.contexts.length - 1],
                paths = [], selectors;
    
            this.contexts.push(paths);
    
            if (!rulesetNode.root) {
                selectors = rulesetNode.selectors;
                if (selectors) {
                    selectors = selectors.filter(function(selector) { return selector.getIsOutput(); });
                    rulesetNode.selectors = selectors.length ? selectors : (selectors = null);
                    if (selectors) { rulesetNode.joinSelectors(paths, context, selectors); }
                }
                if (!selectors) { rulesetNode.rules = null; }
                rulesetNode.paths = paths;
            }
        },
        visitRulesetOut: function (rulesetNode) {
            this.contexts.length = this.contexts.length - 1;
        },
        visitMedia: function (mediaNode, visitArgs) {
            var context = this.contexts[this.contexts.length - 1];
            mediaNode.rules[0].root = (context.length === 0 || context[0].multiMedia);
        },
        visitAtRule: function (atRuleNode, visitArgs) {
            var context = this.contexts[this.contexts.length - 1];
            if (atRuleNode.rules && atRuleNode.rules.length) {
                atRuleNode.rules[0].root = (atRuleNode.isRooted || context.length === 0 || null);
            }
        }
    };
    
    module.exports = JoinSelectorVisitor;
    
    },{"./visitor":97}],95:[function(require,module,exports){
    var SetTreeVisibilityVisitor = function(visible) {
        this.visible = visible;
    };
    SetTreeVisibilityVisitor.prototype.run = function(root) {
        this.visit(root);
    };
    SetTreeVisibilityVisitor.prototype.visitArray = function(nodes) {
        if (!nodes) {
            return nodes;
        }
    
        var cnt = nodes.length, i;
        for (i = 0; i < cnt; i++) {
            this.visit(nodes[i]);
        }
        return nodes;
    };
    SetTreeVisibilityVisitor.prototype.visit = function(node) {
        if (!node) {
            return node;
        }
        if (node.constructor === Array) {
            return this.visitArray(node);
        }
    
        if (!node.blocksVisibility || node.blocksVisibility()) {
            return node;
        }
        if (this.visible) {
            node.ensureVisibility();
        } else {
            node.ensureInvisibility();
        }
    
        node.accept(this);
        return node;
    };
    module.exports = SetTreeVisibilityVisitor;
    },{}],96:[function(require,module,exports){
    var tree = require('../tree'),
        Visitor = require('./visitor');
    
    var CSSVisitorUtils = function(context) {
        this._visitor = new Visitor(this);
        this._context = context;
    };
    
    CSSVisitorUtils.prototype = {
        containsSilentNonBlockedChild: function(bodyRules) {
            var rule;
            if (!bodyRules) {
                return false;
            }
            for (var r = 0; r < bodyRules.length; r++) {
                rule = bodyRules[r];
                if (rule.isSilent && rule.isSilent(this._context) && !rule.blocksVisibility()) {
                    // the atrule contains something that was referenced (likely by extend)
                    // therefore it needs to be shown in output too
                    return true;
                }
            }
            return false;
        },
    
        keepOnlyVisibleChilds: function(owner) {
            if (owner && owner.rules) {
                owner.rules = owner.rules.filter(function(thing) {
                    return thing.isVisible();
                });
            }
        },
    
        isEmpty: function(owner) {
            return (owner && owner.rules) 
                ? (owner.rules.length === 0) : true;
        },
    
        hasVisibleSelector: function(rulesetNode) {
            return (rulesetNode && rulesetNode.paths)
                ? (rulesetNode.paths.length > 0) : false;
        },
    
        resolveVisibility: function (node, originalRules) {
            if (!node.blocksVisibility()) {
                if (this.isEmpty(node) && !this.containsSilentNonBlockedChild(originalRules)) {
                    return ;
                }
    
                return node;
            }
    
            var compiledRulesBody = node.rules[0];
            this.keepOnlyVisibleChilds(compiledRulesBody);
    
            if (this.isEmpty(compiledRulesBody)) {
                return ;
            }
    
            node.ensureVisibility();
            node.removeVisibilityBlock();
    
            return node;
        },
    
        isVisibleRuleset: function(rulesetNode) {
            if (rulesetNode.firstRoot) {
                return true;
            }
    
            if (this.isEmpty(rulesetNode)) {
                return false;
            }
    
            if (!rulesetNode.root && !this.hasVisibleSelector(rulesetNode)) {
                return false;
            }
    
            return true;
        }
    
    };
    
    var ToCSSVisitor = function(context) {
        this._visitor = new Visitor(this);
        this._context = context;
        this.utils = new CSSVisitorUtils(context);
    };
    
    ToCSSVisitor.prototype = {
        isReplacing: true,
        run: function (root) {
            return this._visitor.visit(root);
        },
    
        visitDeclaration: function (declNode, visitArgs) {
            if (declNode.blocksVisibility() || declNode.variable) {
                return;
            }
            return declNode;
        },
    
        visitMixinDefinition: function (mixinNode, visitArgs) {
            // mixin definitions do not get eval'd - this means they keep state
            // so we have to clear that state here so it isn't used if toCSS is called twice
            mixinNode.frames = [];
        },
    
        visitExtend: function (extendNode, visitArgs) {
        },
    
        visitComment: function (commentNode, visitArgs) {
            if (commentNode.blocksVisibility() || commentNode.isSilent(this._context)) {
                return;
            }
            return commentNode;
        },
    
        visitMedia: function(mediaNode, visitArgs) {
            var originalRules = mediaNode.rules[0].rules;
            mediaNode.accept(this._visitor);
            visitArgs.visitDeeper = false;
    
            return this.utils.resolveVisibility(mediaNode, originalRules);
        },
    
        visitImport: function (importNode, visitArgs) {
            if (importNode.blocksVisibility()) {
                return ;
            }
            return importNode;
        },
    
        visitAtRule: function(atRuleNode, visitArgs) {
            if (atRuleNode.rules && atRuleNode.rules.length) {
                return this.visitAtRuleWithBody(atRuleNode, visitArgs);
            } else {
                return this.visitAtRuleWithoutBody(atRuleNode, visitArgs);
            }
        },
    
        visitAnonymous: function(anonymousNode, visitArgs) {
            if (!anonymousNode.blocksVisibility()) {
                anonymousNode.accept(this._visitor);
                return anonymousNode;
            }
        },
    
        visitAtRuleWithBody: function(atRuleNode, visitArgs) {
            // if there is only one nested ruleset and that one has no path, then it is
            // just fake ruleset
            function hasFakeRuleset(atRuleNode) {
                var bodyRules = atRuleNode.rules;
                return bodyRules.length === 1 && (!bodyRules[0].paths || bodyRules[0].paths.length === 0);
            }
            function getBodyRules(atRuleNode) {
                var nodeRules = atRuleNode.rules;
                if (hasFakeRuleset(atRuleNode)) {
                    return nodeRules[0].rules;
                }
    
                return nodeRules;
            }
            // it is still true that it is only one ruleset in array
            // this is last such moment
            // process childs
            var originalRules = getBodyRules(atRuleNode);
            atRuleNode.accept(this._visitor);
            visitArgs.visitDeeper = false;
    
            if (!this.utils.isEmpty(atRuleNode)) {
                this._mergeRules(atRuleNode.rules[0].rules);
            }
    
            return this.utils.resolveVisibility(atRuleNode, originalRules);
        },
    
        visitAtRuleWithoutBody: function(atRuleNode, visitArgs) {
            if (atRuleNode.blocksVisibility()) {
                return;
            }
    
            if (atRuleNode.name === '@charset') {
                // Only output the debug info together with subsequent @charset definitions
                // a comment (or @media statement) before the actual @charset atrule would
                // be considered illegal css as it has to be on the first line
                if (this.charset) {
                    if (atRuleNode.debugInfo) {
                        var comment = new tree.Comment('/* ' + atRuleNode.toCSS(this._context).replace(/\n/g, '') + ' */\n');
                        comment.debugInfo = atRuleNode.debugInfo;
                        return this._visitor.visit(comment);
                    }
                    return;
                }
                this.charset = true;
            }
    
            return atRuleNode;
        },
    
        checkValidNodes: function(rules, isRoot) {
            if (!rules) {
                return;
            }
    
            for (var i = 0; i < rules.length; i++) {
                var ruleNode = rules[i];
                if (isRoot && ruleNode instanceof tree.Declaration && !ruleNode.variable) {
                    throw { message: 'Properties must be inside selector blocks. They cannot be in the root',
                        index: ruleNode.getIndex(), filename: ruleNode.fileInfo() && ruleNode.fileInfo().filename};
                }
                if (ruleNode instanceof tree.Call) {
                    throw { message: 'Function \'' + ruleNode.name + '\' is undefined',
                        index: ruleNode.getIndex(), filename: ruleNode.fileInfo() && ruleNode.fileInfo().filename};
                }
                if (ruleNode.type && !ruleNode.allowRoot) {
                    throw { message: ruleNode.type + ' node returned by a function is not valid here',
                        index: ruleNode.getIndex(), filename: ruleNode.fileInfo() && ruleNode.fileInfo().filename};
                }
            }
        },
    
        visitRuleset: function (rulesetNode, visitArgs) {
            // at this point rulesets are nested into each other
            var rule, rulesets = [];
    
            this.checkValidNodes(rulesetNode.rules, rulesetNode.firstRoot);
    
            if (!rulesetNode.root) {
                // remove invisible paths
                this._compileRulesetPaths(rulesetNode);
    
                // remove rulesets from this ruleset body and compile them separately
                var nodeRules = rulesetNode.rules, nodeRuleCnt = nodeRules ? nodeRules.length : 0;
                for (var i = 0; i < nodeRuleCnt; ) {
                    rule = nodeRules[i];
                    if (rule && rule.rules) {
                        // visit because we are moving them out from being a child
                        rulesets.push(this._visitor.visit(rule));
                        nodeRules.splice(i, 1);
                        nodeRuleCnt--;
                        continue;
                    }
                    i++;
                }
                // accept the visitor to remove rules and refactor itself
                // then we can decide nogw whether we want it or not
                // compile body
                if (nodeRuleCnt > 0) {
                    rulesetNode.accept(this._visitor);
                } else {
                    rulesetNode.rules = null;
                }
                visitArgs.visitDeeper = false;
    
            } else { // if (! rulesetNode.root) {
                rulesetNode.accept(this._visitor);
                visitArgs.visitDeeper = false;
            }
    
            if (rulesetNode.rules) {
                this._mergeRules(rulesetNode.rules);
                this._removeDuplicateRules(rulesetNode.rules);
            }
    
            // now decide whether we keep the ruleset
            if (this.utils.isVisibleRuleset(rulesetNode)) {
                rulesetNode.ensureVisibility();
                rulesets.splice(0, 0, rulesetNode);
            }
    
            if (rulesets.length === 1) {
                return rulesets[0];
            }
            return rulesets;
        },
    
        _compileRulesetPaths: function(rulesetNode) {
            if (rulesetNode.paths) {
                rulesetNode.paths = rulesetNode.paths
                    .filter(function(p) {
                        var i;
                        if (p[0].elements[0].combinator.value === ' ') {
                            p[0].elements[0].combinator = new(tree.Combinator)('');
                        }
                        for (i = 0; i < p.length; i++) {
                            if (p[i].isVisible() && p[i].getIsOutput()) {
                                return true;
                            }
                        }
                        return false;
                    });
            }
        },
    
        _removeDuplicateRules: function(rules) {
            if (!rules) { return; }
    
            // remove duplicates
            var ruleCache = {},
                ruleList, rule, i;
    
            for (i = rules.length - 1; i >= 0 ; i--) {
                rule = rules[i];
                if (rule instanceof tree.Declaration) {
                    if (!ruleCache[rule.name]) {
                        ruleCache[rule.name] = rule;
                    } else {
                        ruleList = ruleCache[rule.name];
                        if (ruleList instanceof tree.Declaration) {
                            ruleList = ruleCache[rule.name] = [ruleCache[rule.name].toCSS(this._context)];
                        }
                        var ruleCSS = rule.toCSS(this._context);
                        if (ruleList.indexOf(ruleCSS) !== -1) {
                            rules.splice(i, 1);
                        } else {
                            ruleList.push(ruleCSS);
                        }
                    }
                }
            }
        },
    
        _mergeRules: function(rules) {
            if (!rules) {
                return; 
            }
    
            var groups    = {},
                groupsArr = [];
            
            for (var i = 0; i < rules.length; i++) {
                var rule = rules[i];
                if (rule.merge) {
                    var key = rule.name;
                    groups[key] ? rules.splice(i--, 1) : 
                        groupsArr.push(groups[key] = []);
                    groups[key].push(rule);
                }
            }
    
            groupsArr.forEach(function(group) {
                if (group.length > 0) {
                    var result = group[0],
                        space  = [],
                        comma  = [new tree.Expression(space)];
                    group.forEach(function(rule) {
                        if ((rule.merge === '+') && (space.length > 0)) {
                            comma.push(new tree.Expression(space = []));
                        }
                        space.push(rule.value);
                        result.important = result.important || rule.important;
                    });
                    result.value = new tree.Value(comma);
                }
            });
        }
    };
    
    module.exports = ToCSSVisitor;
    
    },{"../tree":67,"./visitor":97}],97:[function(require,module,exports){
    var tree = require('../tree');
    
    var _visitArgs = { visitDeeper: true },
        _hasIndexed = false;
    
    function _noop(node) {
        return node;
    }
    
    function indexNodeTypes(parent, ticker) {
        // add .typeIndex to tree node types for lookup table
        var key, child;
        for (key in parent) { 
            /* eslint guard-for-in: 0 */
            child = parent[key];
            switch (typeof child) {
                case 'function':
                    // ignore bound functions directly on tree which do not have a prototype
                    // or aren't nodes
                    if (child.prototype && child.prototype.type) {
                        child.prototype.typeIndex = ticker++;
                    }
                    break;
                case 'object':
                    ticker = indexNodeTypes(child, ticker);
                    break;
            
            }
        }
        return ticker;
    }
    
    var Visitor = function(implementation) {
        this._implementation = implementation;
        this._visitInCache = {};
        this._visitOutCache = {};
    
        if (!_hasIndexed) {
            indexNodeTypes(tree, 1);
            _hasIndexed = true;
        }
    };
    
    Visitor.prototype = {
        visit: function(node) {
            if (!node) {
                return node;
            }
    
            var nodeTypeIndex = node.typeIndex;
            if (!nodeTypeIndex) {
                // MixinCall args aren't a node type?
                if (node.value && node.value.typeIndex) {
                    this.visit(node.value);
                }
                return node;
            }
    
            var impl = this._implementation,
                func = this._visitInCache[nodeTypeIndex],
                funcOut = this._visitOutCache[nodeTypeIndex],
                visitArgs = _visitArgs,
                fnName;
    
            visitArgs.visitDeeper = true;
    
            if (!func) {
                fnName = 'visit' + node.type;
                func = impl[fnName] || _noop;
                funcOut = impl[fnName + 'Out'] || _noop;
                this._visitInCache[nodeTypeIndex] = func;
                this._visitOutCache[nodeTypeIndex] = funcOut;
            }
    
            if (func !== _noop) {
                var newNode = func.call(impl, node, visitArgs);
                if (node && impl.isReplacing) {
                    node = newNode;
                }
            }
    
            if (visitArgs.visitDeeper && node && node.accept) {
                node.accept(this);
            }
    
            if (funcOut != _noop) {
                funcOut.call(impl, node);
            }
    
            return node;
        },
        visitArray: function(nodes, nonReplacing) {
            if (!nodes) {
                return nodes;
            }
    
            var cnt = nodes.length, i;
    
            // Non-replacing
            if (nonReplacing || !this._implementation.isReplacing) {
                for (i = 0; i < cnt; i++) {
                    this.visit(nodes[i]);
                }
                return nodes;
            }
    
            // Replacing
            var out = [];
            for (i = 0; i < cnt; i++) {
                var evald = this.visit(nodes[i]);
                if (evald === undefined) { continue; }
                if (!evald.splice) {
                    out.push(evald);
                } else if (evald.length) {
                    this.flatten(evald, out);
                }
            }
            return out;
        },
        flatten: function(arr, out) {
            if (!out) {
                out = [];
            }
    
            var cnt, i, item,
                nestedCnt, j, nestedItem;
    
            for (i = 0, cnt = arr.length; i < cnt; i++) {
                item = arr[i];
                if (item === undefined) {
                    continue;
                }
                if (!item.splice) {
                    out.push(item);
                    continue;
                }
    
                for (j = 0, nestedCnt = item.length; j < nestedCnt; j++) {
                    nestedItem = item[j];
                    if (nestedItem === undefined) {
                        continue;
                    }
                    if (!nestedItem.splice) {
                        out.push(nestedItem);
                    } else if (nestedItem.length) {
                        this.flatten(nestedItem, out);
                    }
                }
            }
    
            return out;
        }
    };
    module.exports = Visitor;
    
    },{"../tree":67}],98:[function(require,module,exports){
    "use strict";
    
    // rawAsap provides everything we need except exception management.
    var rawAsap = require("./raw");
    // RawTasks are recycled to reduce GC churn.
    var freeTasks = [];
    // We queue errors to ensure they are thrown in right order (FIFO).
    // Array-as-queue is good enough here, since we are just dealing with exceptions.
    var pendingErrors = [];
    var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);
    
    function throwFirstError() {
        if (pendingErrors.length) {
            throw pendingErrors.shift();
        }
    }
    
    /**
     * Calls a task as soon as possible after returning, in its own event, with priority
     * over other events like animation, reflow, and repaint. An error thrown from an
     * event will not interrupt, nor even substantially slow down the processing of
     * other events, but will be rather postponed to a lower priority event.
     * @param {{call}} task A callable object, typically a function that takes no
     * arguments.
     */
    module.exports = asap;
    function asap(task) {
        var rawTask;
        if (freeTasks.length) {
            rawTask = freeTasks.pop();
        } else {
            rawTask = new RawTask();
        }
        rawTask.task = task;
        rawAsap(rawTask);
    }
    
    // We wrap tasks with recyclable task objects.  A task object implements
    // `call`, just like a function.
    function RawTask() {
        this.task = null;
    }
    
    // The sole purpose of wrapping the task is to catch the exception and recycle
    // the task object after its single use.
    RawTask.prototype.call = function () {
        try {
            this.task.call();
        } catch (error) {
            if (asap.onerror) {
                // This hook exists purely for testing purposes.
                // Its name will be periodically randomized to break any code that
                // depends on its existence.
                asap.onerror(error);
            } else {
                // In a web browser, exceptions are not fatal. However, to avoid
                // slowing down the queue of pending tasks, we rethrow the error in a
                // lower priority turn.
                pendingErrors.push(error);
                requestErrorThrow();
            }
        } finally {
            this.task = null;
            freeTasks[freeTasks.length] = this;
        }
    };
    
    },{"./raw":99}],99:[function(require,module,exports){
    (function (global){
    "use strict";
    
    // Use the fastest means possible to execute a task in its own turn, with
    // priority over other events including IO, animation, reflow, and redraw
    // events in browsers.
    //
    // An exception thrown by a task will permanently interrupt the processing of
    // subsequent tasks. The higher level `asap` function ensures that if an
    // exception is thrown by a task, that the task queue will continue flushing as
    // soon as possible, but if you use `rawAsap` directly, you are responsible to
    // either ensure that no exceptions are thrown from your task, or to manually
    // call `rawAsap.requestFlush` if an exception is thrown.
    module.exports = rawAsap;
    function rawAsap(task) {
        if (!queue.length) {
            requestFlush();
            flushing = true;
        }
        // Equivalent to push, but avoids a function call.
        queue[queue.length] = task;
    }
    
    var queue = [];
    // Once a flush has been requested, no further calls to `requestFlush` are
    // necessary until the next `flush` completes.
    var flushing = false;
    // `requestFlush` is an implementation-specific method that attempts to kick
    // off a `flush` event as quickly as possible. `flush` will attempt to exhaust
    // the event queue before yielding to the browser's own event loop.
    var requestFlush;
    // The position of the next task to execute in the task queue. This is
    // preserved between calls to `flush` so that it can be resumed if
    // a task throws an exception.
    var index = 0;
    // If a task schedules additional tasks recursively, the task queue can grow
    // unbounded. To prevent memory exhaustion, the task queue will periodically
    // truncate already-completed tasks.
    var capacity = 1024;
    
    // The flush function processes all tasks that have been scheduled with
    // `rawAsap` unless and until one of those tasks throws an exception.
    // If a task throws an exception, `flush` ensures that its state will remain
    // consistent and will resume where it left off when called again.
    // However, `flush` does not make any arrangements to be called again if an
    // exception is thrown.
    function flush() {
        while (index < queue.length) {
            var currentIndex = index;
            // Advance the index before calling the task. This ensures that we will
            // begin flushing on the next task the task throws an error.
            index = index + 1;
            queue[currentIndex].call();
            // Prevent leaking memory for long chains of recursive calls to `asap`.
            // If we call `asap` within tasks scheduled by `asap`, the queue will
            // grow, but to avoid an O(n) walk for every task we execute, we don't
            // shift tasks off the queue after they have been executed.
            // Instead, we periodically shift 1024 tasks off the queue.
            if (index > capacity) {
                // Manually shift all values starting at the index back to the
                // beginning of the queue.
                for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {
                    queue[scan] = queue[scan + index];
                }
                queue.length -= index;
                index = 0;
            }
        }
        queue.length = 0;
        index = 0;
        flushing = false;
    }
    
    // `requestFlush` is implemented using a strategy based on data collected from
    // every available SauceLabs Selenium web driver worker at time of writing.
    // https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593
    
    // Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that
    // have WebKitMutationObserver but not un-prefixed MutationObserver.
    // Must use `global` or `self` instead of `window` to work in both frames and web
    // workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.
    
    /* globals self */
    var scope = typeof global !== "undefined" ? global : self;
    var BrowserMutationObserver = scope.MutationObserver || scope.WebKitMutationObserver;
    
    // MutationObservers are desirable because they have high priority and work
    // reliably everywhere they are implemented.
    // They are implemented in all modern browsers.
    //
    // - Android 4-4.3
    // - Chrome 26-34
    // - Firefox 14-29
    // - Internet Explorer 11
    // - iPad Safari 6-7.1
    // - iPhone Safari 7-7.1
    // - Safari 6-7
    if (typeof BrowserMutationObserver === "function") {
        requestFlush = makeRequestCallFromMutationObserver(flush);
    
    // MessageChannels are desirable because they give direct access to the HTML
    // task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera
    // 11-12, and in web workers in many engines.
    // Although message channels yield to any queued rendering and IO tasks, they
    // would be better than imposing the 4ms delay of timers.
    // However, they do not work reliably in Internet Explorer or Safari.
    
    // Internet Explorer 10 is the only browser that has setImmediate but does
    // not have MutationObservers.
    // Although setImmediate yields to the browser's renderer, it would be
    // preferrable to falling back to setTimeout since it does not have
    // the minimum 4ms penalty.
    // Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and
    // Desktop to a lesser extent) that renders both setImmediate and
    // MessageChannel useless for the purposes of ASAP.
    // https://github.com/kriskowal/q/issues/396
    
    // Timers are implemented universally.
    // We fall back to timers in workers in most engines, and in foreground
    // contexts in the following browsers.
    // However, note that even this simple case requires nuances to operate in a
    // broad spectrum of browsers.
    //
    // - Firefox 3-13
    // - Internet Explorer 6-9
    // - iPad Safari 4.3
    // - Lynx 2.8.7
    } else {
        requestFlush = makeRequestCallFromTimer(flush);
    }
    
    // `requestFlush` requests that the high priority event queue be flushed as
    // soon as possible.
    // This is useful to prevent an error thrown in a task from stalling the event
    // queue if the exception handled by Node.js’s
    // `process.on("uncaughtException")` or by a domain.
    rawAsap.requestFlush = requestFlush;
    
    // To request a high priority event, we induce a mutation observer by toggling
    // the text of a text node between "1" and "-1".
    function makeRequestCallFromMutationObserver(callback) {
        var toggle = 1;
        var observer = new BrowserMutationObserver(callback);
        var node = document.createTextNode("");
        observer.observe(node, {characterData: true});
        return function requestCall() {
            toggle = -toggle;
            node.data = toggle;
        };
    }
    
    // The message channel technique was discovered by Malte Ubl and was the
    // original foundation for this library.
    // http://www.nonblocking.io/2011/06/windownexttick.html
    
    // Safari 6.0.5 (at least) intermittently fails to create message ports on a
    // page's first load. Thankfully, this version of Safari supports
    // MutationObservers, so we don't need to fall back in that case.
    
    // function makeRequestCallFromMessageChannel(callback) {
    //     var channel = new MessageChannel();
    //     channel.port1.onmessage = callback;
    //     return function requestCall() {
    //         channel.port2.postMessage(0);
    //     };
    // }
    
    // For reasons explained above, we are also unable to use `setImmediate`
    // under any circumstances.
    // Even if we were, there is another bug in Internet Explorer 10.
    // It is not sufficient to assign `setImmediate` to `requestFlush` because
    // `setImmediate` must be called *by name* and therefore must be wrapped in a
    // closure.
    // Never forget.
    
    // function makeRequestCallFromSetImmediate(callback) {
    //     return function requestCall() {
    //         setImmediate(callback);
    //     };
    // }
    
    // Safari 6.0 has a problem where timers will get lost while the user is
    // scrolling. This problem does not impact ASAP because Safari 6.0 supports
    // mutation observers, so that implementation is used instead.
    // However, if we ever elect to use timers in Safari, the prevalent work-around
    // is to add a scroll event listener that calls for a flush.
    
    // `setTimeout` does not call the passed callback if the delay is less than
    // approximately 7 in web workers in Firefox 8 through 18, and sometimes not
    // even then.
    
    function makeRequestCallFromTimer(callback) {
        return function requestCall() {
            // We dispatch a timeout with a specified delay of 0 for engines that
            // can reliably accommodate that request. This will usually be snapped
            // to a 4 milisecond delay, but once we're flushing, there's no delay
            // between events.
            var timeoutHandle = setTimeout(handleTimer, 0);
            // However, since this timer gets frequently dropped in Firefox
            // workers, we enlist an interval handle that will try to fire
            // an event 20 times per second until it succeeds.
            var intervalHandle = setInterval(handleTimer, 50);
    
            function handleTimer() {
                // Whichever timer succeeds will cancel both timers and
                // execute the callback.
                clearTimeout(timeoutHandle);
                clearInterval(intervalHandle);
                callback();
            }
        };
    }
    
    // This is for `asap.js` only.
    // Its name will be periodically randomized to break any code that depends on
    // its existence.
    rawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;
    
    // ASAP was originally a nextTick shim included in Q. This was factored out
    // into this ASAP package. It was later adapted to RSVP which made further
    // amendments. These decisions, particularly to marginalize MessageChannel and
    // to capture the MutationObserver implementation in a closure, were integrated
    // back into ASAP proper.
    // https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js
    
    }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
    },{}],100:[function(require,module,exports){
    var clone = (function() {
    'use strict';
    
    function _instanceof(obj, type) {
      return type != null && obj instanceof type;
    }
    
    var nativeMap;
    try {
      nativeMap = Map;
    } catch(_) {
      // maybe a reference error because no `Map`. Give it a dummy value that no
      // value will ever be an instanceof.
      nativeMap = function() {};
    }
    
    var nativeSet;
    try {
      nativeSet = Set;
    } catch(_) {
      nativeSet = function() {};
    }
    
    var nativePromise;
    try {
      nativePromise = Promise;
    } catch(_) {
      nativePromise = function() {};
    }
    
    /**
     * Clones (copies) an Object using deep copying.
     *
     * This function supports circular references by default, but if you are certain
     * there are no circular references in your object, you can save some CPU time
     * by calling clone(obj, false).
     *
     * Caution: if `circular` is false and `parent` contains circular references,
     * your program may enter an infinite loop and crash.
     *
     * @param `parent` - the object to be cloned
     * @param `circular` - set to true if the object to be cloned may contain
     *    circular references. (optional - true by default)
     * @param `depth` - set to a number if the object is only to be cloned to
     *    a particular depth. (optional - defaults to Infinity)
     * @param `prototype` - sets the prototype to be used when cloning an object.
     *    (optional - defaults to parent prototype).
     * @param `includeNonEnumerable` - set to true if the non-enumerable properties
     *    should be cloned as well. Non-enumerable properties on the prototype
     *    chain will be ignored. (optional - false by default)
    */
    function clone(parent, circular, depth, prototype, includeNonEnumerable) {
      if (typeof circular === 'object') {
        depth = circular.depth;
        prototype = circular.prototype;
        includeNonEnumerable = circular.includeNonEnumerable;
        circular = circular.circular;
      }
      // maintain two arrays for circular references, where corresponding parents
      // and children have the same index
      var allParents = [];
      var allChildren = [];
    
      var useBuffer = typeof Buffer != 'undefined';
    
      if (typeof circular == 'undefined')
        circular = true;
    
      if (typeof depth == 'undefined')
        depth = Infinity;
    
      // recurse this function so we don't reset allParents and allChildren
      function _clone(parent, depth) {
        // cloning null always returns null
        if (parent === null)
          return null;
    
        if (depth === 0)
          return parent;
    
        var child;
        var proto;
        if (typeof parent != 'object') {
          return parent;
        }
    
        if (_instanceof(parent, nativeMap)) {
          child = new nativeMap();
        } else if (_instanceof(parent, nativeSet)) {
          child = new nativeSet();
        } else if (_instanceof(parent, nativePromise)) {
          child = new nativePromise(function (resolve, reject) {
            parent.then(function(value) {
              resolve(_clone(value, depth - 1));
            }, function(err) {
              reject(_clone(err, depth - 1));
            });
          });
        } else if (clone.__isArray(parent)) {
          child = [];
        } else if (clone.__isRegExp(parent)) {
          child = new RegExp(parent.source, __getRegExpFlags(parent));
          if (parent.lastIndex) child.lastIndex = parent.lastIndex;
        } else if (clone.__isDate(parent)) {
          child = new Date(parent.getTime());
        } else if (useBuffer && Buffer.isBuffer(parent)) {
          if (Buffer.allocUnsafe) {
            // Node.js >= 4.5.0
            child = Buffer.allocUnsafe(parent.length);
          } else {
            // Older Node.js versions
            child = new Buffer(parent.length);
          }
          parent.copy(child);
          return child;
        } else if (_instanceof(parent, Error)) {
          child = Object.create(parent);
        } else {
          if (typeof prototype == 'undefined') {
            proto = Object.getPrototypeOf(parent);
            child = Object.create(proto);
          }
          else {
            child = Object.create(prototype);
            proto = prototype;
          }
        }
    
        if (circular) {
          var index = allParents.indexOf(parent);
    
          if (index != -1) {
            return allChildren[index];
          }
          allParents.push(parent);
          allChildren.push(child);
        }
    
        if (_instanceof(parent, nativeMap)) {
          parent.forEach(function(value, key) {
            var keyChild = _clone(key, depth - 1);
            var valueChild = _clone(value, depth - 1);
            child.set(keyChild, valueChild);
          });
        }
        if (_instanceof(parent, nativeSet)) {
          parent.forEach(function(value) {
            var entryChild = _clone(value, depth - 1);
            child.add(entryChild);
          });
        }
    
        for (var i in parent) {
          var attrs;
          if (proto) {
            attrs = Object.getOwnPropertyDescriptor(proto, i);
          }
    
          if (attrs && attrs.set == null) {
            continue;
          }
          child[i] = _clone(parent[i], depth - 1);
        }
    
        if (Object.getOwnPropertySymbols) {
          var symbols = Object.getOwnPropertySymbols(parent);
          for (var i = 0; i < symbols.length; i++) {
            // Don't need to worry about cloning a symbol because it is a primitive,
            // like a number or string.
            var symbol = symbols[i];
            var descriptor = Object.getOwnPropertyDescriptor(parent, symbol);
            if (descriptor && !descriptor.enumerable && !includeNonEnumerable) {
              continue;
            }
            child[symbol] = _clone(parent[symbol], depth - 1);
            if (!descriptor.enumerable) {
              Object.defineProperty(child, symbol, {
                enumerable: false
              });
            }
          }
        }
    
        if (includeNonEnumerable) {
          var allPropertyNames = Object.getOwnPropertyNames(parent);
          for (var i = 0; i < allPropertyNames.length; i++) {
            var propertyName = allPropertyNames[i];
            var descriptor = Object.getOwnPropertyDescriptor(parent, propertyName);
            if (descriptor && descriptor.enumerable) {
              continue;
            }
            child[propertyName] = _clone(parent[propertyName], depth - 1);
            Object.defineProperty(child, propertyName, {
              enumerable: false
            });
          }
        }
    
        return child;
      }
    
      return _clone(parent, depth);
    }
    
    /**
     * Simple flat clone using prototype, accepts only objects, usefull for property
     * override on FLAT configuration object (no nested props).
     *
     * USE WITH CAUTION! This may not behave as you wish if you do not know how this
     * works.
     */
    clone.clonePrototype = function clonePrototype(parent) {
      if (parent === null)
        return null;
    
      var c = function () {};
      c.prototype = parent;
      return new c();
    };
    
    // private utility functions
    
    function __objToStr(o) {
      return Object.prototype.toString.call(o);
    }
    clone.__objToStr = __objToStr;
    
    function __isDate(o) {
      return typeof o === 'object' && __objToStr(o) === '[object Date]';
    }
    clone.__isDate = __isDate;
    
    function __isArray(o) {
      return typeof o === 'object' && __objToStr(o) === '[object Array]';
    }
    clone.__isArray = __isArray;
    
    function __isRegExp(o) {
      return typeof o === 'object' && __objToStr(o) === '[object RegExp]';
    }
    clone.__isRegExp = __isRegExp;
    
    function __getRegExpFlags(re) {
      var flags = '';
      if (re.global) flags += 'g';
      if (re.ignoreCase) flags += 'i';
      if (re.multiline) flags += 'm';
      return flags;
    }
    clone.__getRegExpFlags = __getRegExpFlags;
    
    return clone;
    })();
    
    if (typeof module === 'object' && module.exports) {
      module.exports = clone;
    }
    
    },{}],101:[function(require,module,exports){
    'use strict';
    
    var asap = require('asap/raw');
    
    function noop() {}
    
    // States:
    //
    // 0 - pending
    // 1 - fulfilled with _value
    // 2 - rejected with _value
    // 3 - adopted the state of another promise, _value
    //
    // once the state is no longer pending (0) it is immutable
    
    // All `_` prefixed properties will be reduced to `_{random number}`
    // at build time to obfuscate them and discourage their use.
    // We don't use symbols or Object.defineProperty to fully hide them
    // because the performance isn't good enough.
    
    
    // to avoid using try/catch inside critical functions, we
    // extract them to here.
    var LAST_ERROR = null;
    var IS_ERROR = {};
    function getThen(obj) {
      try {
        return obj.then;
      } catch (ex) {
        LAST_ERROR = ex;
        return IS_ERROR;
      }
    }
    
    function tryCallOne(fn, a) {
      try {
        return fn(a);
      } catch (ex) {
        LAST_ERROR = ex;
        return IS_ERROR;
      }
    }
    function tryCallTwo(fn, a, b) {
      try {
        fn(a, b);
      } catch (ex) {
        LAST_ERROR = ex;
        return IS_ERROR;
      }
    }
    
    module.exports = Promise;
    
    function Promise(fn) {
      if (typeof this !== 'object') {
        throw new TypeError('Promises must be constructed via new');
      }
      if (typeof fn !== 'function') {
        throw new TypeError('Promise constructor\'s argument is not a function');
      }
      this._40 = 0;
      this._65 = 0;
      this._55 = null;
      this._72 = null;
      if (fn === noop) return;
      doResolve(fn, this);
    }
    Promise._37 = null;
    Promise._87 = null;
    Promise._61 = noop;
    
    Promise.prototype.then = function(onFulfilled, onRejected) {
      if (this.constructor !== Promise) {
        return safeThen(this, onFulfilled, onRejected);
      }
      var res = new Promise(noop);
      handle(this, new Handler(onFulfilled, onRejected, res));
      return res;
    };
    
    function safeThen(self, onFulfilled, onRejected) {
      return new self.constructor(function (resolve, reject) {
        var res = new Promise(noop);
        res.then(resolve, reject);
        handle(self, new Handler(onFulfilled, onRejected, res));
      });
    }
    function handle(self, deferred) {
      while (self._65 === 3) {
        self = self._55;
      }
      if (Promise._37) {
        Promise._37(self);
      }
      if (self._65 === 0) {
        if (self._40 === 0) {
          self._40 = 1;
          self._72 = deferred;
          return;
        }
        if (self._40 === 1) {
          self._40 = 2;
          self._72 = [self._72, deferred];
          return;
        }
        self._72.push(deferred);
        return;
      }
      handleResolved(self, deferred);
    }
    
    function handleResolved(self, deferred) {
      asap(function() {
        var cb = self._65 === 1 ? deferred.onFulfilled : deferred.onRejected;
        if (cb === null) {
          if (self._65 === 1) {
            resolve(deferred.promise, self._55);
          } else {
            reject(deferred.promise, self._55);
          }
          return;
        }
        var ret = tryCallOne(cb, self._55);
        if (ret === IS_ERROR) {
          reject(deferred.promise, LAST_ERROR);
        } else {
          resolve(deferred.promise, ret);
        }
      });
    }
    function resolve(self, newValue) {
      // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure
      if (newValue === self) {
        return reject(
          self,
          new TypeError('A promise cannot be resolved with itself.')
        );
      }
      if (
        newValue &&
        (typeof newValue === 'object' || typeof newValue === 'function')
      ) {
        var then = getThen(newValue);
        if (then === IS_ERROR) {
          return reject(self, LAST_ERROR);
        }
        if (
          then === self.then &&
          newValue instanceof Promise
        ) {
          self._65 = 3;
          self._55 = newValue;
          finale(self);
          return;
        } else if (typeof then === 'function') {
          doResolve(then.bind(newValue), self);
          return;
        }
      }
      self._65 = 1;
      self._55 = newValue;
      finale(self);
    }
    
    function reject(self, newValue) {
      self._65 = 2;
      self._55 = newValue;
      if (Promise._87) {
        Promise._87(self, newValue);
      }
      finale(self);
    }
    function finale(self) {
      if (self._40 === 1) {
        handle(self, self._72);
        self._72 = null;
      }
      if (self._40 === 2) {
        for (var i = 0; i < self._72.length; i++) {
          handle(self, self._72[i]);
        }
        self._72 = null;
      }
    }
    
    function Handler(onFulfilled, onRejected, promise){
      this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
      this.onRejected = typeof onRejected === 'function' ? onRejected : null;
      this.promise = promise;
    }
    
    /**
     * Take a potentially misbehaving resolver function and make sure
     * onFulfilled and onRejected are only called once.
     *
     * Makes no guarantees about asynchrony.
     */
    function doResolve(fn, promise) {
      var done = false;
      var res = tryCallTwo(fn, function (value) {
        if (done) return;
        done = true;
        resolve(promise, value);
      }, function (reason) {
        if (done) return;
        done = true;
        reject(promise, reason);
      });
      if (!done && res === IS_ERROR) {
        done = true;
        reject(promise, LAST_ERROR);
      }
    }
    
    },{"asap/raw":99}],102:[function(require,module,exports){
    'use strict';
    
    //This file contains the ES6 extensions to the core Promises/A+ API
    
    var Promise = require('./core.js');
    
    module.exports = Promise;
    
    /* Static Functions */
    
    var TRUE = valuePromise(true);
    var FALSE = valuePromise(false);
    var NULL = valuePromise(null);
    var UNDEFINED = valuePromise(undefined);
    var ZERO = valuePromise(0);
    var EMPTYSTRING = valuePromise('');
    
    function valuePromise(value) {
      var p = new Promise(Promise._61);
      p._65 = 1;
      p._55 = value;
      return p;
    }
    Promise.resolve = function (value) {
      if (value instanceof Promise) return value;
    
      if (value === null) return NULL;
      if (value === undefined) return UNDEFINED;
      if (value === true) return TRUE;
      if (value === false) return FALSE;
      if (value === 0) return ZERO;
      if (value === '') return EMPTYSTRING;
    
      if (typeof value === 'object' || typeof value === 'function') {
        try {
          var then = value.then;
          if (typeof then === 'function') {
            return new Promise(then.bind(value));
          }
        } catch (ex) {
          return new Promise(function (resolve, reject) {
            reject(ex);
          });
        }
      }
      return valuePromise(value);
    };
    
    Promise.all = function (arr) {
      var args = Array.prototype.slice.call(arr);
    
      return new Promise(function (resolve, reject) {
        if (args.length === 0) return resolve([]);
        var remaining = args.length;
        function res(i, val) {
          if (val && (typeof val === 'object' || typeof val === 'function')) {
            if (val instanceof Promise && val.then === Promise.prototype.then) {
              while (val._65 === 3) {
                val = val._55;
              }
              if (val._65 === 1) return res(i, val._55);
              if (val._65 === 2) reject(val._55);
              val.then(function (val) {
                res(i, val);
              }, reject);
              return;
            } else {
              var then = val.then;
              if (typeof then === 'function') {
                var p = new Promise(then.bind(val));
                p.then(function (val) {
                  res(i, val);
                }, reject);
                return;
              }
            }
          }
          args[i] = val;
          if (--remaining === 0) {
            resolve(args);
          }
        }
        for (var i = 0; i < args.length; i++) {
          res(i, args[i]);
        }
      });
    };
    
    Promise.reject = function (value) {
      return new Promise(function (resolve, reject) {
        reject(value);
      });
    };
    
    Promise.race = function (values) {
      return new Promise(function (resolve, reject) {
        values.forEach(function(value){
          Promise.resolve(value).then(resolve, reject);
        });
      });
    };
    
    /* Prototype Methods */
    
    Promise.prototype['catch'] = function (onRejected) {
      return this.then(null, onRejected);
    };
    
    },{"./core.js":101}],103:[function(require,module,exports){
    // should work in any browser without browserify
    
    if (typeof Promise.prototype.done !== 'function') {
      Promise.prototype.done = function (onFulfilled, onRejected) {
        var self = arguments.length ? this.then.apply(this, arguments) : this
        self.then(null, function (err) {
          setTimeout(function () {
            throw err
          }, 0)
        })
      }
    }
    },{}],104:[function(require,module,exports){
    // not "use strict" so we can declare global "Promise"
    
    var asap = require('asap');
    
    if (typeof Promise === 'undefined') {
      Promise = require('./lib/core.js')
      require('./lib/es6-extensions.js')
    }
    
    require('./polyfill-done.js');
    
    },{"./lib/core.js":101,"./lib/es6-extensions.js":102,"./polyfill-done.js":103,"asap":98}]},{},[2])(2)
    });